Climate change denial

American Senator Jim Inhofe, a known climate change denier, displayed a snowball on the U.S. Senate floor in winter 2015, saying "it’s very, very cold out. Very unseasonable". The director of NASA's Goddard Institute for Space Studies quickly reacted and distinguished local weather in a single location from global climate change.

Climate change denial (also global warming denial or climate denial) is pseudoscientific dismissal or doubt that contradicts the scientific consensus on climate change. Those promoting denial commonly use rhetorical tactics to give the appearance of a scientific controversy where there is none. Climate change denial includes doubts about the extent to which climate change is caused by humans, its effects on nature and human society, and the potential of adaptation to global warming by human actions. To a lesser extent, climate change denial can also be implicit when people accept the science but fail to reconcile it with their belief or action. Several social science studies have analyzed these positions as forms of denialism, pseudoscience, or propaganda.

Many issues that are settled in the scientific community, such as human responsibility for global warming, remain the subject of politically or economically motivated attempts to downplay, dismiss or deny them—an ideological phenomenon academics and scientists call climate change denial. Climate scientists, especially in the United States, have reported government and oil-industry pressure to censor or suppress their work and hide scientific data, with directives not to discuss the subject publicly. The fossil fuels lobby has been identified as overtly or covertly supporting efforts to undermine or discredit the scientific consensus on global warming.

Industrial, political and ideological interests organize activity to undermine public trust in climate science. Climate change denial has been associated with the fossil fuels lobby, the Koch brothers, industry advocates, ultraconservative think tanks, and ultraconservative alternative media, often in the U.S. More than 90% of papers that are skeptical of climate change originate from right-wing think tanks. Climate change denial is undermining efforts to act on or adapt to climate change, and exerts a powerful influence on the politics of global warming and the manufactured global warming controversy.

In the 1970s, oil companies published research that broadly concurred with the scientific community's view on global warming. Since then, for several decades, oil companies have been organizing a widespread and systematic climate change denial campaign to seed public disinformation, a strategy that has been compared to the tobacco industry's organized denial of the hazards of tobacco smoking. Some of the campaigns are even carried out by the same people who previously spread the tobacco industry's denialist propaganda.

Terminology

One deceptive approach is cherry picking data from short time periods to assert that global average temperatures are not rising. Blue trendlines show short-term countertrends that mask longer-term warming trends that are shown by red trendlines. Such representations have been applied to the so-called global warming hiatus (blue rectangle with blue dots, upper right).

"Climate change skepticism" and "climate change denial" refer to pseudoscientific denial, dismissal, or doubt of the scientific consensus on the rate and extent of global warming, its significance, or its connection to human behavior, in whole or in part. Though there is a distinction between skepticism about and outright denial of an assertion, in the public debate phrases such as "climate skepticism" have frequently been used with the same meaning as climate denialism or contrarianism.

The terminology emerged in the 1990s. Even though all scientists adhere to scientific skepticism as an inherent part of the process, by November 1995 the word "skeptic" was being used specifically for the minority who publicized views contrary to the scientific consensus. This small group of scientists presented their views in public statements and the media rather than to the scientific community. This usage continued. In his December 1995 article "The Heat is On: The warming of the world's climate sparks a blaze of denial", Ross Gelbspan said industry had engaged "a small band of skeptics" to confuse public opinion in a "persistent and well-funded campaign of denial". His 1997 book The Heat is On may have been the first to concentrate specifically on the topic. In it, Gelbspan discussed a "pervasive denial of global warming" in a "persistent campaign of denial and suppression" involving "undisclosed funding of these 'greenhouse skeptics'" with "the climate skeptics" confusing the public and influencing decision makers.

The 2006 CBC Television documentary The Denial Machine is about this campaign. In 2007, journalist Sharon Begley reported on the "denial machine", a phrase academics subsequently used.

In addition to explicit denial, social groups have shown implicit denial by accepting the scientific consensus but failing to "translate their acceptance into action". This was exemplified in Kari Norgaard's study of a village in Norway affected by climate change, where residents diverted their attention to other issues.

The terminology is debated: most of those actively rejecting the scientific consensus use the terms skeptic and climate change skepticism, and only a few have expressed preference for being described as deniers, but the word "skepticism" is incorrectly used, as scientific skepticism is an intrinsic part of scientific methodology. The term contrarian is more specific but less frequently used. In academic literature and journalism, the terms "climate change denial" and "climate change deniers" have well-established usage as descriptive terms without any pejorative intent. Both the National Center for Science Education and historian Spencer R. Weart recognize that both options are problematic, but have decided to use "climate change denial" rather than "skepticism".

Terms related to "denialism" have been criticized for introducing a moralistic tone and potentially implying a link with Holocaust denial. It has been claimed that this link is intentional, which academics have strongly disputed. The usage of "denial" long predates the Holocaust, and is commonly applied in other areas, such as HIV/AIDS denialism; John Timmer of Ars Technica describes the claim as itself a form of denial.

In December 2014, an open letter from the Committee for Skeptical Inquiry called on the media to stop using the term "skepticism" when referring to climate change denial. It contrasted scientific skepticism—which is "foundational to the scientific method"—with denial—"the a priori rejection of ideas without objective consideration"—and the behavior of those involved in political attempts to undermine climate science. It said: "Not all individuals who call themselves climate change skeptics are deniers. But virtually all deniers have falsely branded themselves as skeptics. By perpetrating this misnomer, journalists have granted undeserved credibility to those who reject science and scientific inquiry." In June 2015, The New York Times's public editor told Media Matters for America that the Times was increasingly using "denier" when "someone is challenging established science", but assessing this on an individual basis with no fixed policy, and would not use the term when someone was "kind of wishy-washy on the subject or in the middle". The executive director of the Society of Environmental Journalists said that while there was reasonable skepticism about specific issues, she felt that "denier" was "the most accurate term when someone claims there is no such thing as global warming, or agrees that it exists but denies that it has any cause we could understand or any impact that could be measured."

The Committee for Skeptical Inquiry letter inspired a petition by climatetruth.org in which signers were asked to "Tell the Associated Press: Establish a rule in the AP Stylebook ruling out the use of 'skeptic' to describe those who deny scientific facts." On 22 September 2015, the Associated Press announced "an addition to AP Stylebook entry on global warming" that advised "to describe those who don't accept climate science or dispute the world is warming from human-made forces, use 'climate change doubters' or 'those who reject mainstream climate science'. Avoid use of 'skeptics' or 'deniers.'" On 17 May 2019, The Guardian also rejected use of the term "climate skeptic" in favor of "climate science denier".

Categories

Characteristics of science denial (including climate science denial)

Climate change denial sign in Sudbury, Canada (2016)

In 2004, Stefan Rahmstorf described how the media give the misleading impression that climate change is still disputed within the scientific community, attributing this impression to climate change skeptics' PR efforts. He identified different positions that climate skeptics argue, which he used as a taxonomy of climate change skepticism. (Later the model was also applied to denial.)

1. Trend sceptics or deniers (who deny there is global warming), [and] argue that no significant climate warming is taking place at all, claiming that the warming trend measured by weather stations is an artefact due to urbanisation around those stations ("urban heat island effect").
2. Attribution sceptics or deniers (who accept the global warming trend but see natural causes for this), [and] doubt that human activities are responsible for the observed trends. A few of them even deny that the rise in the atmospheric CO₂ content is anthropogenic [while others argue that] additional CO₂ does not lead to discernible warming [and] that there must be other—natural—causes for warming.
3. Impact sceptics or deniers (who think global warming is harmless or even beneficial).
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This taxonomy has been used in social science for analysis of publications, and to categorize climate change skepticism and climate change denial. Sometimes, a fourth category, "consensus denial", is added, for people who question the existence of the scientific consensus on anthropogenic global warming.

The National Center for Science Education describes climate change denial as disputing differing points in the scientific consensus, a sequential range of arguments from denying the occurrence of climate change, accepting that but denying any significant human contribution, accepting these but denying scientific findings on how this would affect nature and human society, to accepting all these but denying that humans can mitigate or reduce the problems. James L. Powell provides a more extended list, as does climatologist Michael E. Mann in "six stages of denial", a ladder model whereby deniers have over time conceded acceptance of points, while retreating to a position that still rejects the mainstream consensus:

1. CO₂ is not actually increasing.
2. Even if it is, the increase has no impact on the climate since there is no convincing evidence of warming.
3. Even if there is warming, it is due to natural causes.
4. Even if the warming cannot be explained by natural causes, the human impact is small, and the impact of continued greenhouse gas emissions will be minor.
5. Even if the current and future projected human effects on Earth's climate are not negligible, the changes are generally going to be good for us.
6. Whether or not the changes are going to be good for us, humans are very adept at adapting to changes; besides, it's too late to do anything about it, and/or a technological fix is bound to come along when we really need it.

Journalists and newspaper columnists including George Monbiot and Ellen Goodman, among others, have described climate change denial as a form of denialism.

Chris and Mark Hoofnagle have defined denialism in this context as the use of rhetorical devices "to give the appearance of legitimate debate where there is none, an approach that has the ultimate goal of rejecting a proposition on which a scientific consensus exists." This process characteristically uses one or more of the following tactics:

1. Allegations that scientific consensus involves conspiring to fake data or suppress the truth: a global warming conspiracy theory.
2. Fake experts, or individuals with views at odds with established knowledge, at the same time marginalizing or denigrating published topic experts. Like the manufactured doubt over smoking and health, a few contrarian scientists oppose the climate consensus, some of them the same people.
3. Selectivity, such as cherry-picking atypical or even obsolete papers, in the same way that the MMR vaccine controversy was based on one paper: examples include discredited ideas of the medieval warm period.
4. Unworkable demands of research, claiming that any uncertainty invalidates the field or exaggerating uncertainty while rejecting probabilities and mathematical models.
5. Logical fallacies.

In 2015, environmentalist Bill McKibben accused U.S. President Barack Obama (widely regarded as strongly in favor of action on climate change) of "Catastrophic Climate-Change Denial" for his approval of oil-drilling permits in offshore Alaska. According to McKibben, Obama also "opened huge swaths of the Powder River basin to new coal mining." McKibben calls this "climate denial of the status quo sort", where Obama denies "the meaning of the science, which is that we must keep carbon in the ground."

A study assessed public perception and action on climate change on grounds of belief systems, and identified seven psychological barriers affecting behavior that otherwise would facilitate mitigation, adaptation, and environmental stewardship: cognition, ideological world views, comparisons to key people, costs and momentum, discredence toward experts and authorities, perceived risks of change, and inadequate behavioral changes.

Various groups, including the National Center for Science Education, have described climate change denial as a form of pseudoscience.

Discussing specific aspects of climate change science

The Fourth National Climate Assessment ("NCA4", U.S., 2017) includes charts illustrating how human factors—not various natural factors that have been investigated—are the predominant cause of observed global warming.

Campaigns by climate change deniers portray scientists as disagreeing about global warming, but datasets from various scientific organizations show pairwise correlations of 1850+/1880+ datasets exceeding 99.1%.

Climate change denial opposes the results of academic studies of scientific agreement on human-caused global warming. The level of scientific consensus positively correlates with expertise in climate science.

Further information: History of climate change science § Discredited theories and reconciled apparent discrepancies

Some climate change denial groups say that because CO₂ is only a trace gas in the atmosphere (roughly 400ppm, or 0.04%, 4 parts per 10,000) it can only have a minor effect on the climate. Scientists have known for over a century that even this small proportion has a significant warming effect, and doubling the proportion leads to a large temperature increase. The scientific consensus, as summarized by the IPCC fourth assessment report, the U.S. Geological Survey, and other reports, is that human activity is the leading cause of climate change. The burning of fossil fuels accounts for around 30 billion tons of CO₂ each year, which is 130 times the amount produced by volcanoes. Some groups allege that water vapor is a more significant greenhouse gas, and is left out of many climate models. While water vapor is a greenhouse gas, the very short atmospheric lifetime of water vapor (about 10 days) compared to that of CO₂ (hundreds of years) means that CO₂ is the primary driver of increasing temperatures; water vapour acts as a feedback, not a forcing, mechanism. Water vapor has been incorporated into climate models since their inception in the late 1800s.

Climate denial groups may also argue that global warming stopped recently, that a global warming hiatus is in effect, or that global temperatures are actually decreasing, leading to global cooling. These arguments are based on short-term fluctuations, and ignore the long-term pattern.

Some groups and prominent deniers such as William Happer argue that there is a greenhouse gas saturation effect that significantly decreases the warming potential of further gases released into the atmosphere. Such an effect does exist in some form, as Happer's research demonstrates, but is likely negligible with respect to net global warming.

During a May 2018 meeting of the United States House Committee on Science, Space, and Technology, Representative Mo Brooks claimed that sea level rise is caused not by melting glaciers but rather by coastal erosion and silt that flows from rivers into the ocean.

Climate change denial literature often features the suggestion that we should wait for better technologies before addressing climate change, when they will be more affordable and effective.

Playing up the potential non-human causes

Further information: History of climate change science § Solar variation

Climate denial groups often point to natural variability, such as sunspots and cosmic rays, to explain the warming trend. According to these groups, there is natural variability that will abate over time, and human influences have little to do with it. However, these factors are already taken into account when developing climate models. In fact, the scientific consensus is that they cannot explain the observed warming trend.

Using studies that are flawed

Dennis T. Avery, a food policy analyst at the Hudson Institute, wrote an article titled "500 Scientists Whose Research Contradicts Man-Made Global Warming Scares" published in 2007, by the Heartland Institute. The list was immediately called into question for misunderstanding and distorting the conclusions of many of the named studies and citing outdated, flawed studies that had long been abandoned. Many of the scientists included in the list demanded their names be removed. At least 45 scientists had no idea they were included as "co-authors" and disagreed with the conclusions of the document. The Heartland Institute refused these requests, stating that the scientists "have no right—legally or ethically—to demand that their names be removed from a bibliography composed by researchers with whom they disagree".

Attempts to discredit IPCC reports and processes

Further information: Intergovernmental Panel on Climate Change § Challenges and controversies

Deniers have generally attacked either the IPCC's processes, scientist or the synthesis and executive summaries; the full reports attract less attention.

In 2005, the House of Lords Economics Committee wrote, "We have some concerns about the objectivity of the IPCC process, with some of its emissions scenarios and summary documentation apparently influenced by political considerations." It doubted the high emission scenarios and said that the IPCC had "played-down" what the committee called "some positive aspects of global warming". The main statements of the House of Lords Economics Committee were rejected in the response made by the United Kingdom government.

On 10 December 2008, a report was released by the U.S. Senate Committee on Environment and Public Works Minority members, under the leadership of the Senate's most vocal global warming denier Jim Inhofe. It says it summarizes scientific dissent from the IPCC. Many of its statements about the numbers of individuals listed in the report, whether they are actually scientists, and whether they support the positions attributed to them, have been disputed.

Being "luke warm" or being "skeptic"

In 2012, Clive Hamilton published an essay 'Climate change and the soothing message of luke-warmism'. He defined luke warmists as "those who appear to accept the body of climate science but interpret it in a way that is least threatening: emphasising uncertainties, playing down dangers, and advocating a slow and cautious response. They are politically conservative and anxious about the threat to the social structure posed by the implications of climate science. Their “pragmatic” approach is therefore alluring to political leaders looking for a justification for policy minimalism." He associated Ted Nordhaus and Michael Shellenberger of the Breakthrough Institute, but also Roger A. Pielke Jr., Daniel Sarewitz, Steve Rayner, Mike Hulme and "the pre-eminent luke-warmist" Danish economist Bjørn Lomborg.

Climate change skepticism, while in some cases professing to do research on climate change, has focused instead on influencing the opinion of the public, legislators and the media, in contrast to legitimate science.

Over reliance on adaptation only

The conservative National Center for Policy Analysis whose "Environmental Task Force" contains a number of climate change deniers including Sherwood Idso and S. Fred Singer says, "The growing consensus on climate change policies is that adaptation will protect present and future generations from climate-sensitive risks far more than efforts to restrict CO₂ emissions."

The adaptation-only plan is also endorsed by oil companies like ExxonMobil, "ExxonMobil's plan appears to be to stay the course and try to adjust when changes occur. The company's plan is one that involves adaptation, as opposed to leadership," says this Ceres report.

The George W. Bush administration also voiced support for an adaptation-only policy in the US in 2002. "In a stark shift for the Bush administration, the United States has sent a climate report [U.S. Climate Action Report 2002] to the United Nations detailing specific and far-reaching effects it says global warming will inflict on the American environment. In the report, the administration also for the first time places most of the blame for recent global warming on human actions—mainly the burning of fossil fuels that send heat-trapping greenhouse gases into the atmosphere." The report however "does not propose any major shift in the administration's policy on greenhouse gases. Instead it recommends adapting to inevitable changes instead of making rapid and drastic reductions in greenhouse gases to limit warming." This position apparently precipitated a similar shift in emphasis at the COP 8 climate talks in New Delhi several months later, "The shift satisfies the Bush administration, which has fought to avoid mandatory cuts in emissions for fear it would harm the economy. 'We're welcoming a focus on more of a balance on adaptation versus mitigation', said a senior American negotiator in New Delhi. 'You don't have enough money to do everything.'"

Some find this shift and attitude disingenuous and indicative of an inherent bias against prevention (i.e. reducing emissions/consumption) and for the prolonging of profits to the oil industry at the expense of the environment. "Now that the dismissal of climate change is no longer fashionable, the professional deniers are trying another means of stopping us from taking action. It would be cheaper, they say, to wait for the impacts of climate change and then adapt to them" says writer and environmental activist George Monbiot in an article addressing the supposed economic hazards of addressing climate change.

Delaying climate change mitigation measures

Climate change deniers insist on debating whether action (such as the restrictions on the use of fossil fuels to reduce carbon-dioxide emissions) should be taken now or in the near future. They are fearful of the economic ramifications of such restrictions. For example, in a speech in 1998 a staff member of the Cato Institute, a libertarian think tank, argued that the negative economic effects of emission controls outweighed their environmental benefits. Climate change deniers tend to argue that even if global warming is caused solely by the burning of fossil fuels, restricting their use would have more damaging effects on the world economy than the increases in global temperature.

Conversely, the general consensus is that early action to reduce emissions would help avoid much greater economic costs later, and would reduce the risk of catastrophic, irreversible change.

Earlier, climate change deniers' online YouTube content focused on denying global warming, or saying such warming isn't caused by humans burning fossil fuel. As such denials became untenable, content shifted to asserting that climate solutions are not workable, saying global warming is harmless or even beneficial, and accusing the environmental movement of being unreliable.

Conspiracy theories

Climate change conspiracy theories assert that the scientific consensus on global warming is based on conspiracies to produce manipulated data or suppress dissent. It is one of a number of tactics used in climate change denial to attempt to manufacture political and public controversy disputing this consensus. Conspiracy theorists typically allege that, through worldwide acts of professional and criminal misconduct, the science behind global warming and climate change has been invented or distorted for ideological or financial reasons. They allege that scientists and institutions involved in global warming research are part of a global scientific conspiracy or engaged in a manipulative hoax.

There have been allegations of malpractice, most notably in the Climatic Research Unit email controversy ("ClimateGate"). Eight committees investigated these allegations and published reports, each finding no evidence of fraud or scientific misconduct. The Muir Russell report stated that the scientists' "rigor and honesty as scientists are not in doubt," that the investigators "did not find any evidence of behavior that might undermine the conclusions of the IPCC assessments," but that there had been "a consistent pattern of failing to display the proper degree of openness." The scientific consensus that global warming is occurring as a result of human activity remained unchanged at the end of the investigations.

Global warming conspiracy theories have been posited which allege that the scientific consensus is illusory, or that climatologists are acting on their own financial interests by causing undue alarm about a changing climate. No evidence of such a conspiracy has been presented, and strong consensus exists among scientists from a multitude of political, social, organizational and national backgrounds about the extent and cause of climate change. Much of the data used in climate science is publicly available to be viewed and interpreted by competing researchers and the public, controverting accusations that scientists are hiding data or stonewalling requests.

In 2012, research by Stephan Lewandowsky (then of the University of Western Australia) concluded that belief in other conspiracy theories was associated with being more likely to endorse climate change denial.

Rep. Marjorie Taylor Greene @RepMTG

We live on a spinning planet that rotates around a much bigger sun along with other planets and heavenly bodies rotating around the sun that all create gravitational pull on one another while our galaxy rotates and travels through the universe. Considering all of that, yes our climate will change, and it's totally normal! ... Don't fall for the scam, fossil fuels are natural and amazing.

Apr 15, 2023

An April 15, 2023 tweet by Republican U.S. Representative Marjorie Taylor Greene said climate change was a "scam" and that "fossil fuels are natural and amazing", saying that "there are some very powerful people that are getting rich beyond their wildest dreams convincing many that carbon is the enemy". Her tweet included a chart that omitted carbon dioxide and methane—the two most dominant greenhouse gas emissions.

When a moderator at the August 23, 2023, Republican presidential debate asked the candidates to raise their hands if they believed human behavior is causing climate change, none raised their hands. Entrepreneur Vivek Ramaswamy claimed that "the climate change agenda is a hoax", and also that "more people are dying of climate change policies than they actually are of climate change"; none of his competitors challenged him directly on climate. After investigating Ramaswamy's latter claim, a Washington Post fact check found no supporting evidence.

Alleged conspiracies by scientists who accept the reality of global warming

• Faked scientific data: In 2002, after Clive Hamilton criticized Lavoisier Group, the Cooler Heads Coalition published an article supporting the Lavoisier Group's conspiracy theory that hundreds of climate scientists have twisted their results to support the climate change theory in order to protect their research funding. In 2007, climate change denier John Coleman wrote a blog post claiming that global warming is "the greatest scam in history". He wrote "So when these researchers did climate change studies in the late 90's they were eager to produce findings that would be important and be widely noticed and trigger more research funding. It was easy for them to manipulate the data to come up with the results they wanted to make headlines and at the same time drive their environmental agendas". The climate deniers involved in Climategate in 2009 claimed that researchers faked the data in their research publications and suppressed their critics in order to receive more funding (i.e. taxpayer money). Some climate change deniers claim that there is no scientific consensus on climate change, and they sometimes claim that any evidence that shows there is scientific consensus is faked. Some of them even claim that governments have used the research grant money to pervert the science.
• Corrupted peer-review process: It is claimed that the peer-review process for papers in climate science has become corrupted by scientists seeking to suppress dissent. For example, climate change denier Frederick Seitz wrote an article in Wall Street Journal in 1996 criticizing IPCC Second Assessment Report. He suspected corruption in the peer-review process, writing that "A comparison between the report approved by the contributing scientists and the published version reveals that key changes were made after the scientists had met and accepted what they thought was the final peer-reviewed version".

Alleged political conspiracies

• Aiming at global governance: In a speech given to the US Senate Committee on the Environment and Public Works on July 28, 2003, entitled "The Science of Climate Change", senator James Inhofe, a Republican from Oklahoma, concluded by asking the following question: "With all of the hysteria, all of the fear, all of the phony science, could it be that man-made global warming is the greatest hoax ever perpetrated on the American people?" He further stated, "some parts of the IPCC process resembled a Soviet-style trial, in which the facts are predetermined, and ideological purity trumps technical and scientific rigor." Inhofe has suggested that supporters of the Kyoto Protocol such as Jacques Chirac are aiming at global governance. William M. Gray said in 2006 that global warming became a political cause because of the lack of any other enemy following the end of the Cold War. He went on to say that its purpose was to exercise political influence, to try to introduce world government, and to control people, adding, "I have a demonic view on this." The TV documentary The Great Global Warming Swindle was made by Martin Durkin, who called global warming "a multi-billion-dollar worldwide industry, created by fanatically anti-industrial environmentalists." In the Washington Times in 2007 he said that his film would change history, and predicted that "in five years the idea that the greenhouse effect is the main reason behind global warming will be seen as total bunk."
• Liberal extremists: There are theories claiming that "climate change is a hoax perpetrated by leftist radicals to undermine local sovereignty", or "climate science is less about science and more about socialist ideology". In 2017, James Inhofe told the 12th International Conference on Climate Change "The liberal extremists are not going to give up. Obama has built a culture of radical alarmists, and they’ll be back. You and I and the American people have won a great victory, but the war goes on. Stay vigilant."
• Green scam: "Another conspiracy theory argues that because many people have invested in renewable-energy companies, they stand to lose a lot of money if global warming is shown to be a myth. According to this theory, environmental groups therefore bribe climate scientists to doctor their data so that they are able to secure their financial investment in green energy."
• China is behind it: In 2010, Donald Trump claimed that "With the coldest winter ever recorded, with snow setting record levels up and down the coast, the Nobel committee should take the Nobel Prize back from Al Gore....Gore wants us to clean up our factories and plants in order to protect us from global warming, when China and other countries couldn’t care less. It would make us totally noncompetitive in the manufacturing world, and China, Japan and India are laughing at America’s stupidity." Then in 2012, he tweeted that "The concept of global warming was created by and for the Chinese in order to make U.S. manufacturing non-competitive." Later in 2016 during his presidential campaign he suggested that his 2012 tweet was a joke saying that "Obviously, I joke. But this is done for the benefit of China, because China does not do anything to help climate change. They burn everything you could burn; they couldn’t care less. They have very—you know, their standards are nothing. But they—in the meantime, they can undercut us on price. So it’s very hard on our business."
• To promote nuclear power: One of the claims made in The Great Global Warming Swindle is that the "threat of global warming is an attempt to promote nuclear power".
• False flags and controlling the weather: Extreme weather events, including wildfires and floods, have been attributed by conspiracy theorists to laser beams, deliberate actions by government or the antifa movement, and weather engineering such as cloud seeding.

Connections to other debates

Links with other environmental issues

Many of the climate change deniers have disagreed, in whole or part, with the scientific consensus regarding other issues, particularly those relating to environmental risks, such as ozone depletion, DDT, and passive smoking.

For example, in 1992 an EPA report linked second-hand smoke with lung cancer. In response, the tobacco industry engaged the APCO Worldwide public relations company, which set out a strategy of astroturfing campaigns to cast doubt on the science by linking smoking anxieties with other issues, including global warming, in order to turn public opinion against calls for government intervention. The campaign depicted public concerns as "unfounded fears" supposedly based only on "junk science" in contrast to their "sound science", and operated through front groups, primarily the Advancement of Sound Science Center (TASSC) and its Junk Science website, run by Steven Milloy. A tobacco company memo commented "Doubt is our product since it is the best means of competing with the 'body of fact' that exists in the mind of the general public. It is also the means of establishing a controversy." During the 1990s, the tobacco campaign died away, and TASSC began taking funding from oil companies including Exxon. Its website became central in distributing "almost every kind of climate-change denial that has found its way into the popular press."

In the 1990s, the Marshall Institute began campaigning against increased regulations on environmental issues such as acid rain, ozone depletion, second-hand smoke, and the dangers of DDT. In each case their argument was that the science was too uncertain to justify any government intervention, a strategy it borrowed from earlier efforts to downplay the health effects of tobacco in the 1980s. This campaign would continue for the next two decades.

These efforts succeeded in influencing public perception of climate science. Between 1988 and the 1990s, public discourse shifted from the science and data of climate change to discussion of politics and surrounding controversy.

Links with nationalism

See also: Right-wing antiscience and Eco-fascism

It has been suggested that climate change can conflict with a nationalistic view because it is "unsolvable" at the national level and requires collective action between nations or between local communities, and that therefore populist nationalism tends to reject the science of climate change.

In 2019, U.S. Undersecretary of Energy Mark W. Menezes said that the Freeport LNG project's exports would be "spreading freedom gas throughout the world", while Assistant Secretary for Fossil Energy Steven Winberg echoed the call to internationally export "molecules of US freedom".

On the other hand, it has been argued that effective climate action is polycentric rather than international, and national interest in multilateral groups can be furthered by overcoming climate change denial. Climate change contrarians may believe in a "caricature" of internationalist state intervention that is perceived as threatening national sovereignty, and may re-attribute risks such as flooding to international institutions. UK Independence Party policy on climate change has been influenced by noted contrarian Christopher Monckton and then by its energy spokesman Roger Helmer MEP who stated in a speech "It is not clear that the rise in atmospheric CO₂ is anthropogenic."

Jerry Taylor of the Niskanen Center posits that climate change denial is an important component of Trumpian historical consciousness, and "plays a significant role in the architecture of Trumpism as a developing philosophical system".

Though climate change denial was apparently waning circa 2021, some right-wing nationalist organizations have adopted a theory of "environmental populism" advocating that natural resources should be preserved for a nation's existing residents, to the exclusion of immigrants. Other such right-wing organizations have contrived new "green wings" that falsely assert it is refugees from poor nations who are the cause of environmental pollution and climate change, and should therefore be excluded.

History

See also: History of climate change science and History of climate change policy and politics

In 1959, a scientist working for Shell suggested in a New Scientist article that carbon cycles are too vast to upset Nature's balance. By 1966 however, a coal industry research organization, Bituminous Coal Research Inc., published its finding that if then prevailing trends of coal consumption continue, "the temperature of the earth's atmosphere will increase and that vast changes in the climates of the earth will result." "Such changes in temperature will cause melting of the polar icecaps, which, in turn, would result in the inundation of many coastal cities, including New York and London." In a discussion following this paper in the same publication, a combustion engineer for Peabody Coal, now Peabody Energy, the world's largest coal supplier, added that the coal industry was merely "buying time" before additional government air pollution regulations would be promulgated to clean the air. Nevertheless, the coal industry for decades thereafter publicly advocated the position that increased carbon dioxide in the atmosphere is beneficial for the planet.

In response to increasing public awareness of the greenhouse effect in the 1970s, conservative reaction built up, denying environmental concerns which could lead to government regulation. In 1977 the first Secretary of Energy, Republican James Schlesinger, suggested President Jimmy Carter take no action regarding a climate change memo, citing uncertainty. With the 1981 Presidency of Ronald Reagan, global warming became a political issue, with immediate plans to cut spending on environmental research, particularly climate-related, and stop funding for CO₂ monitoring. Reagan appointed as Secretary of Energy James B. Edwards, who said that there was no real global warming problem. Congressman Al Gore had studied under Revelle and was aware of the developing science: he joined others in arranging congressional hearings from 1981 onwards, with testimony by scientists including Revelle, Stephen Schneider and Wallace Smith Broecker. The hearings gained enough public attention to reduce the cuts in atmospheric research. A polarized party-political debate developed. In 1982, Sherwood B. Idso published his book Carbon Dioxide: Friend or Foe? which said increases in CO₂ would not warm the planet, but would fertilize crops and were "something to be encouraged and not suppressed", while complaining that his theories had been rejected by the "scientific establishment". An Environmental Protection Agency (EPA) report in 1983 said global warming was "not a theoretical problem but a threat whose effects will be felt within a few years", with potentially "catastrophic" consequences. The Reagan administration reacted by calling the report "alarmist", and the dispute got wide news coverage. Public attention turned to other issues, then the 1985 finding of a polar ozone hole brought a swift international response. To the public, this was related to climate change and the possibility of effective action, but news interest faded.

Public attention was renewed amidst summer droughts and heat waves when James Hansen testified to a Congressional hearing on 23 June 1988, stating with high confidence that long-term warming was underway with severe warming likely within the next 50 years, and warning of likely storms and floods. There was increasing media attention: the scientific community had reached a broad consensus that the climate was warming, human activity was very likely the primary cause, and there would be significant consequences if the warming trend was not curbed. These facts encouraged discussion about new laws concerning environmental regulation, which was opposed by the fossil fuel industry.

From 1989 onwards industry-funded organizations including the Global Climate Coalition and the George C. Marshall Institute sought to spread doubt among the public, in a strategy already developed by the tobacco industry. A small group of scientists opposed to the consensus on global warming became politically involved, and with support from conservative political interests, began publishing in books and the press rather than in scientific journals. This small group of scientists included some of the same people that were part of the strategy already tried by the tobacco industry. Spencer Weart identifies this period as the point where legitimate skepticism about basic aspects of climate science was no longer justified, and those spreading mistrust about these issues became deniers. As their arguments were increasingly refuted by the scientific community and new data, deniers turned to political arguments, making personal attacks on the reputation of scientists, and promoting ideas of a global warming conspiracy.

With the 1989 fall of communism and the environmental movement's international reach at the 1992 Rio Earth Summit, the attention of U.S. conservative think tanks, which had been organized in the 1970s as an intellectual counter-movement to socialism, turned from the "red scare" to the "green scare" which they saw as a threat to their aims of private property, free trade market economies and global capitalism. As a counter-movement, they used environmental skepticism to promote denial of the reality of problems such as loss of biodiversity and climate change.

The campaign to spread doubt continued into the 1990s, including an advertising campaign funded by coal industry advocates intended to "reposition global warming as theory rather than fact", and a 1998 proposal written by the American Petroleum Institute intending to recruit scientists to convince politicians, the media and the public that climate science was too uncertain to warrant environmental regulation. The proposal included a US$5,000,000 multi-point strategy to "maximize the impact of scientific views consistent with ours on Congress, the media and other key audiences", with a goal of "raising questions about and undercutting the 'prevailing scientific wisdom'".

In 1998, Gelbspan noted that his fellow journalists accepted that global warming was occurring, but said they were in "'stage-two' denial of the climate crisis", unable to accept the feasibility of answers to the problem. A subsequent book by Milburn and Conrad on The Politics of Denial described "economic and psychological forces" producing denial of the consensus on global warming issues.

These efforts by climate change denial groups were recognized as an organized campaign beginning in the 2000s. The sociologists Riley Dunlap and Aaron McCright played a significant role in this shift when they published an article in 2000 exploring the connection between conservative think tanks and climate change denial. Later work would continue the argument specific groups were marshaling skepticism against climate change – a study in 2008 from the University of Central Florida analyzed the sources of "environmentally skeptical" literature published in the United States. The analysis demonstrated that 92% of the literature was partly or wholly affiliated with a self-proclaimed conservative think tanks. A later piece of research from 2015 identified 4,556 individuals with overlapping network ties to 164 organizations which are responsible for the most efforts to downplay the threat of climate change in the U.S.

A 2022 study found that the public substantially underestimates the degree of scientific consensus that humans are causing climate change. Studies from 2019–2021 found scientific consensus to range from 98.7–100%.

Research found that 80–90% of Americans underestimate the prevalence of support for major climate change mitigation policies and climate concern. While 66–80% Americans support these policies, Americans estimate the prevalence to be 37–43%. Researchers have called this misperception a false social reality, a form of pluralistic ignorance.

Gelbspan's Boiling Point, published in 2004, detailed the fossil-fuel industry's campaign to deny climate change and undermine public confidence in climate science. In Newsweek's August 2007 cover story "The Truth About Denial", Sharon Begley reported that "the denial machine is running at full throttle", and said that this "well-coordinated, well-funded campaign" by contrarian scientists, free-market think tanks, and industry had "created a paralyzing fog of doubt around climate change."

Referencing work of sociologists Robert Antonio and Robert Brulle, Wayne A. White has written that climate change denial has become the top priority in a broader anti-environmental regulation agenda being pursued by neoliberals. In 2005, climate change skepticism was most prominently seen in the United States, where the media disproportionately featured views of the climate change denial community. In addition to offline media, the contrarian movement benefited from the growth of the internet, having gained some of its support from internet bloggers, talk radio hosts and newspaper columnists.

The New York Times and others reported in 2015 that oil companies knew that burning oil and gas could cause climate change and global warming since the 1970s but nonetheless funded deniers for years. Dana Nuccitelli wrote in The Guardian that a small fringe group of climate deniers were no longer taken seriously at the 2015 United Nations Climate Change Conference, in an agreement that "we need to stop delaying and start getting serious about preventing a climate crisis." However, The New York Times says any implementation is voluntary and will depend on any future world leaders—and every Republican U.S. presidential candidate in 2016 questioned or denied the science of climate change.

Ernesto Araújo, the new Minister of Foreign Affairs appointed by the newly elected president Brazil's president Jair Bolsonaro called global warming a plot by "cultural Marxists" and has eliminated the Climate Change Division of the ministry.

Alexandre Lopez-Borrull, a lecturer in Information and Communication Sciences at the Open University of Catalonia, noted in 2023 increases in climate change denial, particularly among supporters of the far right. Climate change deniers threatened meteorologists, accusing them of causing a drought, falsifying thermometer readings, and cherry-picking warmer weather stations to misrepresent global warming. Also in 2023, CNN reported that meteorologists and climate communicators internationally were receiving increased harassment and false accusations that they are lying about or controlling the weather, inflating temperature records to make climate change seem worse, and changing color palettes of weather maps to make them look more dramatic. Tagesschau described this as a global phenomenon. Jennie King, head of Climate Research and Policy at the Institute for Strategic Dialogue, said that growth of such conspiracy theories is "logical evolution of the broader trend around pushback on institutions" that supposedly are trying to "enact some insidious agenda". Meanwhile, after Elon Musk's 2022 takeover of Twitter, key figures in the company who ensured trusted content was prioritized were removed, and climate scientists received a large increase in hostile, threatening, harassing and personally abusive tweets from deniers.

Denial networks

United States

The climate change denial industry is most powerful in the United States. In the 2016 United States election cycle, every Republican presidential candidate, and the Republican leader in the U.S. Senate, questioned or denied climate change, and opposed U.S. government steps to address climate change.

In 2015, a Pentagon report pointed out how climate change denial threatens national security. A study from 2015 identified 4,556 individuals with overlapping network ties to 164 organizations which are responsible for the most efforts to downplay the threat of climate change in the U.S.

In 2013, the Center for Media and Democracy reported that the State Policy Network (SPN), an umbrella group of 64 U.S. think tanks, had been lobbying on behalf of major corporations and conservative donors to oppose climate change regulation.

According to an investigative report in the Chronicle of Higher Education, influential academic papers used to support climate change denialism were written by authors affiliated with Harvard, MIT, and Georgetown University who had undisclosed conflict of interest.

In 2023, Republican politician and Baptist minister Mike Huckabee published Kids Guide to the Truth About Climate Change, which acknowledged global warming but minimized the influence of human emissions. Marketed as an alternative to mainstream education, the publication does not attribute authorship or cite scientific credentials. The deputy director of the National Center for Science Education called the publication "propaganda" and "very unreliable as a guide to climate change for kids", noting that it represented "present day" atmospheric concentrations of carbon dioxide as 280 parts per million (ppm), which was true in 391 BC but short of 2023's actual concentration of 420 ppm.

In 2023, the state of Florida approved a public school curriculum including videos produced by conservative advocacy group PragerU, likening climate change skeptics to those who fought Communism and Nazism, implying renewable energy harms the environment, and saying current global warming occurs naturally.

In Texas, which has a large influence on school textbooks published nationwide, proposed textbooks in 2023 that included more information about the climate crisis than editions a decade earlier. However, some books clouded the human causes of climate change and downplayed the role of fossil fuels, with Texas' Republican Congressional representative August Pfluger emphasizing the importance of "secure, reliable energy" (oil and natural gas) produced in the Permian Basin. Pfluger urged in his Congressional website in September 2023 that "we cannot allow the radical climate lobby to infiltrate Texas middle schools and brainwash our children", claiming that liquefied natural gas is "not only... good for our economy, but it's good for the environment".

International

The Clexit Coalition describes itself as: "A new international organisation [which] aims to prevent ratification of the costly and dangerous Paris global warming treaty". It has members in 26 countries. According to The Guardian: "Clexit leaders are heavily involved in tobacco and fossil fuel-funded organizations".

Publishers, websites

In November 2021, a study by the Center for Countering Digital Hate identified "ten fringe publishers" that together were responsible for nearly 70 percent of Facebook user interactions with content that denied climate change. Facebook said the percentage was overstated and called the study misleading.

The "toxic ten" publishers: Breitbart News, The Western Journal, Newsmax, Townhall, Media Research Center, The Washington Times, The Federalist, The Daily Wire, RT (TV network), and The Patriot Post.

The Rebel Media and its director, Ezra Levant, have promoted climate change denial and oil sands extraction in Alberta.

Emotional and psychological aspects

Main article: Psychology of climate change denial

The director of the Yale Program on Climate Change Communication said that one "almost couldn't design a worse fit for our underlying psychology or our institutions of decision-making" than dealing with climate change—owing primarily to the short-term focus of humans and their institutions. Florida Republican Tom Lee described the emotional impact and reactions of individuals to climate change, saying "If these predictions do bear out, that it's just economically daunting. ... That's why I use the term emotionally shut down, because I think you lose people at hello a lot of times in the Republican conversation over this."

Personal reactions to climate change may include anxiety, depression, despair, dissonance, uncertainty, insecurity, and distress, with one psychologist suggesting that "despair about our changing climate may get in the way of fixing it." The American Psychological Association has urged psychologists and other social scientists to work on psychological barriers to taking action on climate change. The immediacy of a growing number of extreme weather events, and tax incentives for energy efficiency and for purchasing electric vehicles, are thought to motivate people to deal with climate change.

A study published in PLOS Climate studied defensive and secure forms of national identity—respectively called "national narcissism" and "secure national identification"—for their correlation to support for policies to mitigate climate change and to transition to renewable energy. The researchers concluded that secure national identification tends to support policies promoting renewable energy; however, national narcissism was found to be inversely correlated with support for such policies—except to the extent that such policies, as well as greenwashing, enhance the national image. Right-wing political orientation, which may indicate susceptibility to climate conspiracy beliefs, was also concluded to be negatively correlated with support for genuine climate mitigation policies.

Public opinion

Main article: Public opinion on climate change

Results of a Yale Climate Connection-reported survey in 31 countries of public opinion, specifically among Facebook users, on the causes of climate change

Results of a survey overseen by the United Nations Development Programme on belief in whether climate change presents a climate emergency

Public opinion on climate change is significantly affected by media coverage of climate change, and the effects of climate change denial campaigns. Campaigns to undermine public confidence in climate science have decreased public belief in climate change, which in turn have affected legislative efforts to curb CO₂ emissions. Another reason why the public is skeptical about climate change is their lack of knowledge.

United States

Further information: Climate change policy of the United States

In a 2006 ABC News/Time/Stanford Poll, 56% of Americans correctly answered that average global temperatures had risen over the previous three years. However, in the same poll, two-thirds said they believed that scientists had "a lot of disagreement" about "whether or not global warming is happening".

From 2001 to 2012, the number of Americans who said they believe in anthropogenic global warming decreased from 75 percent to 44 percent.

Democrats and Republicans have long differed in views of climate change, with the gap widening in the late 2010s, with Democrats three times more likely to view it as human-caused.

The sharp divide over the existence of and responsibility for global warming and climate change falls largely along political lines. Overall, 60% of Americans surveyed said oil and gas companies were "completely or mostly responsible" for climate change.

Opinion about human causation of climate change increased substantially with education among Democrats, but not among Republicans. Conversely, opinions favoring becoming carbon neutral declined substantially with age among Republicans, but not among Democrats.

National political divides on the seriousness of climate change consistently correlate with political ideology, with right-wing opinion being more negative.

A study found that public climate change policy support and behavior are significantly influenced by public beliefs, attitudes and risk perceptions. As of March 2018 the rate of acceptance among U.S. TV forecasters that the climate is changing has increased to ninety-five percent. The number of local television stories about global warming has also increased, by fifteen-fold. Climate Central has received some of the credit for this because they provide classes for meteorologists and graphics for television stations.

The popular media in the U.S. gives greater attention to climate change skeptics than the scientific community as a whole, and the level of agreement within the scientific community has not been accurately communicated. In some cases, news outlets have allowed climate change skeptics to explain the science of climate change instead of experts in climatology. US and UK media coverage differ from that presented in other countries, where reporting is more consistent with the scientific literature. Some journalists attribute the difference to climate change denial being propagated, mainly in the US, by business-centered organizations employing tactics worked out previously by the US tobacco lobby.

Denial of climate change is most prevalent among white, politically conservative men in the US. In France, the US and the UK, the opinions of climate change skeptics appear much more frequently in conservative news outlets than other news, and in many cases those opinions are left uncontested.

The efforts of Al Gore and other environmental campaigns have focused on the effects of global warming and have managed to increase awareness and concern, but despite these efforts, the number of Americans believing humans are the cause of global warming was holding steady at 61% in 2007, and those believing the popular media was understating the issue remained about 35%. A recent poll from 2015 suggests that while Americans are growing more aware of the dangers and implications of climate change for future generations, the majority are not worried about it. From a survey conducted in 2004, it was found that more than 30% of news presented in the previous decade showed equal attention to both human and non human contributions to global warming.

In 2018, the National Science Teachers Association urged teachers to "emphasize to students that no scientific controversy exists regarding the basic facts of climate change."

Europe

At least 72% of Chinese, American and European respondents to a 2020−2021 European Investment Bank climate survey stated that climate change had an impact on everyday life.

Climate change denial has been promoted by several far-right European parties, including Spain's Vox, Finland's far-right Finns Party, Austria's far-right Freedom Party, and Germany's anti-immigration Alternative for Deutschland (AfD).

In April 2023, French political scientist Jean-Yves Dormagen indicates that it is the modest and conservative classes that are the most restive, and therefore climate-skeptical, to climate change. In a study by the Jean-Jaurès Foundation published the same month, climate skepticism is compared to a new populism whose representative lately would be Steven E. Koonin, as well as for others their spokesman.

Lobbying

Percentage of documents taking each overall position on climate change as real and human-caused, 1977-2014

Efforts to lobby against environmental regulation have included campaigns to manufacture doubt about the science behind climate change, and to obscure the scientific consensus and data. These efforts have undermined public confidence in climate science, and impacted climate change lobbying.

The political advocacy organizations FreedomWorks and Americans for Prosperity, funded by brothers David and Charles Koch of Koch Industries, were important in supporting the Tea Party movement and in encouraging the movement to focus on climate change.

Other conservative organizations, such as The Heritage Foundation, Marshall Institute, Cato Institute, and the American Enterprise Institute were significant participants in these lobbying attempts, seeking to halt or eliminate environmental regulations.

This approach to downplay the significance of climate change was copied from tobacco lobbyists; in the face of scientific evidence linking tobacco to lung cancer, to prevent or delay the introduction of regulation. Lobbyists attempted to discredit the scientific research by creating doubt and manipulating debate. They worked to discredit the scientists involved, to dispute their findings, and to create and maintain an apparent controversy by promoting claims that contradicted scientific research. "'Doubt is our product,' boasted a now infamous 1969 industry memo. Doubt would shield the tobacco industry from litigation and regulation for decades to come." In 2006, George Monbiot wrote in The Guardian about similarities between the methods of groups funded by Exxon, and those of the tobacco giant Philip Morris, including direct attacks on peer-reviewed science, and attempts to create public controversy and doubt.

Former National Academy of Sciences president Frederick Seitz, who, according to an article by Mark Hertsgaard in Vanity Fair, earned about US$585,000 in the 1970s and 1980s as a consultant to R.J. Reynolds Tobacco Company, went on to chair groups such as the Science and Environmental Policy Project and the George C. Marshall Institute alleged to have made efforts to "downplay" global warming. Seitz stated in the 1980s that "Global warming is far more a matter of politics than of climate." Seitz authored the Oregon Petition, a document published jointly by the Marshall Institute and Oregon Institute of Science and Medicine in opposition to the Kyoto protocol. The petition and accompanying "Research Review of Global Warming Evidence" claimed:

The proposed limits on greenhouse gases would harm the environment, hinder the advance of science and technology, and damage the health and welfare of mankind. There is no convincing scientific evidence that human release of carbon dioxide, methane, or other greenhouse gases is causing or will, in the foreseeable future, cause catastrophic heating of the Earth's atmosphere and disruption of the Earth's climate. ... We are living in an increasingly lush environment of plants and animals as a result of the carbon dioxide increase. Our children will enjoy an Earth with far more plant and animal life than that with which we now are blessed. This is a wonderful and unexpected gift from the Industrial Revolution.

George Monbiot wrote in The Guardian that this petition, which he criticizes as misleading and tied to industry funding, "has been cited by almost every journalist who claims that climate change is a myth". Efforts by climate change denial groups played a significant role in the eventual rejection of the Kyoto protocol in the US.

Monbiot has written about another group founded by the tobacco lobby, The Advancement of Sound Science Coalition (TASSC), that now campaigns against measures to combat global warming. In again trying to manufacture the appearance of a grass-roots movement against "unfounded fear" and "over-regulation", Monbiot states that TASSC "has done more damage to the campaign to halt [climate change] than any other body".

The work of economic consultancy Charles River Associates forecasting the impact on employment of the 2003 Climate Stewardship Act was criticized by the Natural Resources Defense Council in 2005 for using unrealistic economic assumptions and producing directionally incorrect estimates. A 2021 study concluded their work from the 1990s to the 2010s overestimated predicted costs and ignored potential policy benefits, and was often presented by politicians and lobbyists as independent rather than sponsored by the fossil fuel industry. Other papers published during that time by economists at MIT and Wharton Econometric Forecasting Associates, also with funding from the fossil fuel industry, produced similar conclusions.

Private sector, institutes and foundations

See also: Business action on climate change and ExxonMobil climate change denial

Research conducted at an Exxon archival collection at the University of Texas and interviews with former employees by journalists indicate the scientific opinion within the company and their public posture towards climate change was contradictory. A systematic review of Exxon's climate modeling projections concluded that in private and academic circles since the late 1970s and early 1980s, ExxonMobil predicted global warming correctly and skillfully, correctly dismissed the possibility of a coming ice age in favor of a "carbon dioxide induced super-interglacial", and reasonably estimated how much CO₂ would lead to dangerous warming.

Between 1989 and 2002, the Global Climate Coalition, a group of mainly United States businesses, used aggressive lobbying and public relations tactics to oppose action to reduce greenhouse gas emissions and fight the Kyoto Protocol. The coalition was financed by large corporations and trade groups from the oil, coal and auto industries. The New York Times reported that "even as the coalition worked to sway opinion [towards skepticism], its own scientific and technical experts were advising that the science backing the role of greenhouse gases in global warming could not be refuted". In 2000, Ford Motor Company was the first company to leave the coalition as a result of pressure from environmentalists, followed by Daimler-Chrysler, Texaco, the Southern Company and General Motors subsequently left to GCC. The organization closed in 2002.

From January 2009 through June 2010, the oil, coal and utility industries spent $500 million in lobby expenditures in opposition to legislation to address climate change.

In early 2015, several media reports emerged saying that Willie Soon, a popular scientist among climate change deniers, had failed to disclose conflicts of interest in at least 11 scientific papers published since 2008. They reported that he received a total of $1.25m from ExxonMobil, Southern Company, the American Petroleum Institute and a foundation run by the Koch brothers. Charles R. Alcock, director of the Harvard–Smithsonian Center for Astrophysics, where Soon was based, said that allowing funders of Soon's work to prohibit disclosure of funding sources was a mistake, which will not be permitted in future grant agreements.

Lewandowsky reports that by asking four questions about the free market he is able to predict with "67% "confidence" (that is, variance)" an individual's attitudes towards climate change.

According to documents leaked in February 2012, The Heartland Institute is developing a curriculum for use in schools which frames climate change as a scientific controversy. In 2017, Glenn Branch, Deputy Director of the National Center for Science Education (NCSE), wrote that "the Heartland Institute is continuing to inflict its climate change denial literature on science teachers across the country". He also described how some science teachers were reacting to Heartland's mailings: "Fortunately, the Heartland mailing continues to be greeted with skepticism and dismissed with scorn." Each significant claim was rated for accuracy by scientists who were experts on that topic. Overall, they scored the accuracy of the booklet with an "F": "it could hardly score lower", and "the 'Key Findings' section are incorrect, misleading, based on flawed logic, or simply factually inaccurate". The NCSE has prepared Classroom Resources in response to Heartland and other anti-science threats.

Public sector

During the 2020 California wildfires

It'll start getting cooler, you just watch. [...] I don't think science knows, actually.

— Then U.S. President Donald Trump,
September 13, 2020.

Former senator Tom Coburn of the United States in 2017 discussing the Paris agreement and denying the scientific consensus on human-caused global warming. Coburn claimed that sea level rise had been no more than 5 mm in 25 years, and asserted there was now global cooling. In 2013 he said "I am a global warming denier. I don't deny that."

The Republican Party in the United States is unique in denying anthropogenic climate change among conservative political parties across the Western world. In 1994, according to a leaked memo, the Republican strategist Frank Luntz advised members of the Republican Party, with regard to climate change, that "you need to continue to make the lack of scientific certainty a primary issue" and "challenge the science" by "recruiting experts who are sympathetic to your view". (In 2006, Luntz said he still believes "back [in] '97, '98, the science was uncertain", but he now agrees with the scientific consensus.) From 2008 to 2017, the Republican Party went from "debating how to combat human-caused climate change to arguing that it does not exist", according to The New York Times. In 2011, "more than half of the Republicans in the House and three-quarters of Republican senators" said "that the threat of global warming, as a human-made and highly threatening phenomenon, is at best an exaggeration and at worst an utter 'hoax'" according to Judith Warner writing in The New York Times Magazine. In 2014, more than 55% of congressional Republicans were climate change deniers, according to NBC News. According to PolitiFact in May 2014, Jerry Brown's statement that "virtually no Republican" in Washington accepts climate change science, was "mostly true"; PolitiFact counted "eight out of 278, or about 3 percent" of Republican members of Congress who "accept the prevailing scientific conclusion that global warming is both real and man-made."

In 2005, The New York Times reported that Philip Cooney, former fossil fuel lobbyist and "climate team leader" at the American Petroleum Institute and President George W. Bush's chief of staff of the Council on Environmental Quality, had "repeatedly edited government climate reports in ways that play down links between such emissions and global warming, according to internal documents". Sharon Begley reported in Newsweek that Cooney "edited a 2002 report on climate science by sprinkling it with phrases such as 'lack of understanding' and 'considerable uncertainty'." Cooney reportedly removed an entire section on climate in one report, whereupon another lobbyist sent him a fax saying "You are doing a great job." Cooney announced his resignation two days after the story of his tampering with scientific reports broke, but a few days later it was announced that Cooney would take up a position with ExxonMobil.

United States Secretary of Energy Rick Perry, in a June 2017 interview with CNBC, acknowledged the existence of climate change and impact from humans, but said that he did not agree with the idea that carbon dioxide was the primary driver of global warming pointing instead to "the ocean waters and this environment that we live in". The American Meteorological Society responded in a letter to Perry saying that it is "critically important that you understand that emissions of carbon dioxide and other greenhouse gases are the primary cause", pointing to conclusions of scientists worldwide.

Republican Jim Bridenstine, the first elected politician to serve as NASA administrator, had previously stated that global temperatures were not rising. A month after the Senate confirmed his NASA position in April 2018, he acknowledged that human emissions of greenhouse gases are raising global temperatures.

Although climate denial have started to decrease among the Republican Party leadership towards an acknowledgement that "the climate is changing", a 2019 study from several major think tanks describes the climate right as "fragmented and underfunded".

Acknowledgement of climate change by politicians, while expressing uncertainty as to how much climate change can be attributed to human activity, has been described as a new form of climate denial, and "a reliable tool to manipulate public perception of climate change and stall political action".

Funding for scientists and networks who are deniers

In 2015, according to The New York Times and others, oil companies knew that burning oil and gas could cause global warming since the 1970s but, nonetheless, funded deniers for years.

Several large corporations within the fossil fuel industry provide significant funding for attempts to mislead the public about the trustworthiness of climate science. ExxonMobil and the Koch family foundations have been identified as especially influential funders of climate change contrarianism. The bankruptcy of the coal company Cloud Peak Energy revealed it funded the Institute for Energy Research, a climate denial think tank, as well as several other policy influencers.

After the IPCC released its Fourth Assessment Report in 2007, the American Enterprise Institute (AEI) offered British, American and other scientists $10,000 plus travel expenses to publish articles critical of the assessment. The institute had received more than US$1.6 million from Exxon, and its vice-chairman of trustees was former head of Exxon Lee Raymond. Raymond sent letters that alleged the IPCC report was not "supported by the analytical work." More than 20 AEI employees worked as consultants to the George W. Bush administration.

The authors of the 2010 book Merchants of Doubt, provide documentation for the assertion that professional deniers have tried to sow seeds of doubt in public opinion in order to halt any meaningful social or political progress to reduce the impact of human carbon emissions. The fact that only half of the American population believes global warming is caused by human activity could be seen as a victory for these deniers. One of the authors' main arguments is that most prominent scientists who have been voicing opposition to the near-universal consensus are being funded by industries, such as automotive and oil, that stand to lose money by government actions to regulate greenhouse gases.

The Global Climate Coalition was an industry coalition that funded several scientists who expressed skepticism about global warming. In the year 2000, several members left the coalition when they became the target of a national divestiture campaign run by John Passacantando and Phil Radford at Ozone Action. According to The New York Times, when Ford Motor Company was the first company to leave the coalition, it was "the latest sign of divisions within heavy industry over how to respond to global warming". After that, between December 1999 and early March 2000, the GCC was deserted by Daimler-Chrysler, Texaco, energy firm the Southern Company and General Motors. The Global Climate Coalition closed in 2002, or in their own words, 'deactivated'.

Documents obtained by Greenpeace under the US Freedom of Information Act show that the Charles G. Koch Foundation gave climate change denier Willie Soon two grants totaling $175,000 in 2005/6 and again in 2010. Multiple grants to Soon from the American Petroleum Institute between 2001 and 2007, totaled $274,000, and from ExxonMobil totaled $335,000 between 2005 and 2010. Other coal and oil industry sources which funded him include the Mobil Foundation, the Texaco Foundation and the Electric Power Research Institute. Soon, acknowledging that he received this money, stated unequivocally that he has "never been motivated by financial reward in any of my scientific research". In February 2015, Greenpeace disclosed papers documenting that Soon failed to disclose to academic journals funding including more than $1.2 million from fossil fuel industry related interests including ExxonMobil, the American Petroleum Institute, the Charles G. Koch Charitable Foundation and the Southern Company.

Donald Kennedy, editor-in-chief of Science, has said that deniers such as Michaels are lobbyists more than researchers, and "I don't think it's unethical any more than most lobbying is unethical," he said. He said donations to deniers amounts to "trying to get a political message across".

Global warming denier Reid Bryson said in June 2007, "There is a lot of money to be made in this ... If you want to be an eminent scientist you have to have a lot of grad students and a lot of grants. You can't get grants unless you say, 'Oh global warming, yes, yes, carbon dioxide'." Similar positions have been advanced by University of Alabama, Huntsville climate scientist Roy Spencer, Spencer's University of Alabama, Huntsville colleague and IPCC contributor John Christy, University of London biogeographer Philip Stott, Accuracy in Media, and Ian Plimer.

Richard Lindzen, a professor of Meteorology at MIT has been the recipient of money from energy interests such as OPEC and the Western Fuels Association, including "$2,500 a day for his consulting services", as well as funding from US federal sources including the National Science Foundation, the Department of Energy, and NASA. Lindzen has criticized the scientific consensus on global climate change. He has been called a contrarian, in relation to climate change and other issues.

There is evidence that some of those alleging climate change conspiracy theories are part of well-funded misinformation campaigns designed to manufacture controversy, undermine the scientific consensus on climate change and downplay the projected effects of global warming. Individuals and organisations kept the global warming debate alive long after most scientists had reached their conclusions. These doubts have influenced policymakers in both Canada and the US, and have helped to form government policies.

Since the late 1980s, this well-coordinated, well-funded campaign by contrarian scientists, free-market think tanks and industry has created a paralyzing fog of doubt around climate change. Through advertisements, op-eds, lobbying and media attention, greenhouse doubters (they hate being called deniers) argued first that the world is not warming; measurements indicating otherwise are flawed, they said. Then they claimed that any warming is natural, not caused by human activities. Now they contend that the looming warming will be minuscule and harmless.

— S. Begley, Newsweek

Between 2002 and 2010, the combined annual income of 91 climate change counter-movement organizations—think tanks, advocacy groups and industry associations—was roughly $900 million. During the same period, billionaires secretively donated nearly $120 million (£77 million) via the Donors Trust and Donors Capital Fund to more than 100 organizations seeking to undermine the public perception of the science on climate change.

Robert Brulle analysed the funding of 91 organizations opposed to restrictions on carbon emissions, which he termed the "climate change counter-movement". Between 2003 and 2013, the donor-advised funds Donors Trust and Donors Capital Fund, combined, were the largest funders, accounting for about one quarter of the total funds, and the American Enterprise Institute was the largest recipient, 16% of the total funds. The study also found that the amount of money donated to these organizations by means of foundations whose funding sources cannot be traced had risen.

As of the end of 2019, in the United States, 97 percent of the coal industry's political contributions and 88 percent of the oil and gas industries' contributions had gone to Republicans, leading economist Paul Krugman to call the Republicans "the world's only major climate-denialist party".

ExxonMobil

Main article: ExxonMobil climate change denial

The Royal Society conducted a survey that found ExxonMobil had given US$2.9 million to American groups that "misinformed the public about climate change", 39 of which "misrepresented the science of climate change by outright denial of the evidence". In 2006, the Royal Society issued a demand that ExxonMobil withdraw funding for climate change denial. The letter drew criticism, notably from Timothy Ball who argued the society attempted to "politicize the private funding of science and to censor scientific debate".

The Greenpeace research project ExxonSecrets, as well as various academics, have linked several scientists who are climate deniers—Fred Singer, Fred Seitz and Patrick Michaels—to organizations funded by ExxonMobil and Philip Morris for the purpose of promoting global warming denial. These organizations include the Cato Institute and the Heritage Foundation. Similarly, groups employing global warming deniers, such as the George C. Marshall Institute, have been criticized for their ties to fossil fuel companies.

On 2 February 2007, The Guardian stated that Kenneth Green, a visiting scholar with AEI, had sent letters to scientists in the UK and the U.S., offering US$10,000 plus travel expenses and other incidental payments in return for essays with the purpose of "highlight[ing] the strengths and weaknesses of the IPCC process", specifically regarding the IPCC Fourth Assessment Report.

Greenpeace presented evidence of the energy industry funding climate change denial in their 'Exxon Secrets' project. An analysis conducted by The Carbon Brief in 2011 found that 9 out of 10 of the most prolific authors who cast doubt on climate change or speak against it had ties to ExxonMobil. Greenpeace have said that Koch industries invested more than US$50 million in the past 50 years on spreading doubts about climate change.

ExxonMobil announced in 2008 that it would cut its funding to many of the groups that "divert attention" from the need to find new sources of clean energy, although in 2008 still funded over "two dozen other organisations who question the science of global warming or attack policies to solve the crisis." A survey carried out by the UK Royal Society found that in 2005 ExxonMobil distributed US$2.9 million to 39 groups that "misrepresented the science of climate change by outright denial of the evidence".

The Union of Concerned Scientists produced a report titled 'Smoke, Mirrors & Hot Air', that criticizes ExxonMobil for "underwriting the most sophisticated and most successful disinformation campaign since the tobacco industry" and for "funnelling about $16 million between 1998 and 2005 to a network of ideological and advocacy organizations that manufacture uncertainty on the issue". In 2006, Exxon said that it was no longer going to fund these groups though that statement has been challenged by Greenpeace.

To investigate how widespread such hidden funding was, senators Barbara Boxer, Edward Markey and Sheldon Whitehouse wrote to a number of companies. Koch general counsel refused the request and said it would infringe the company's first amendment rights.

Effects on public opinion and climate inaction

False balance in climate science: Representation of climate change sceptics among climate scientists (97% believing climate change to be real, 3% denying), and Fox News guests (31% real, 69% denying). Based on IPCC report coverage between August 1 2013 and October 1 2013.

Climate change conspiracy theories and denial have resulted in poor action or no action at all to effectively mitigate the damage done by global warming. In some countries like the United States of America, 40% of Americans believed (ca. 2017) that climate change is a hoax in spite of the fact that there is a 100% consensus among climate scientists that it is not according to a report in 2019.

A study in 2015 stated: “Exposure to conspiracy theories reduced people’s intentions to reduce their carbon footprint, relative to people who were given refuting information."

In 2023, an increase in climate change denial was noted, particularly among supporters of the far right. Climate change deniers threatened meteorologists, accusing them of causing a drought, falsifying thermometer readings, and cherry-picking warmer weather stations to misrepresent global warming. Similarly, after Elon Musk's 2022 takeover of Twitter, key figures in the company who ensured trusted content was prioritized were removed, and climate scientists received a large increase in hostile, threatening, harassing and personally abusive tweets from deniers.

Manufactured uncertainty over climate change, the fundamental strategy of climate change denial, has been very effective, particularly in the US. It has contributed to low levels of public concern and to government inaction worldwide. An Angus Reid poll released in 2010 indicates that global warming skepticism in the United States, Canada, and the United Kingdom has been rising. There may be multiple causes of this trend, including a focus on economic rather than environmental issues, and a negative perception of the United Nations and its role in discussing climate change.

Another cause may be weariness from overexposure to the topic: secondary polls suggest that the public may have been discouraged by extremism when discussing the topic, while other polls show 54% of U.S. voters believe that "the news media make global warming appear worse than it really is." A poll in 2009 regarding the issue of whether "some scientists have falsified research data to support their own theories and beliefs about global warming" showed that 59% of Americans believed it "at least somewhat likely", with 35% believing it was "very likely".

According to Tim Wirth, "They patterned what they did after the tobacco industry. ... Both figured, sow enough doubt, call the science uncertain and in dispute. That's had a huge impact on both the public and Congress." This approach has been propagated by the US media, presenting a false balance between climate science and climate skeptics. Newsweek reports that the majority of Europe and Japan accept the consensus on scientific climate change, but only one third of Americans considered human activity to play a major role in climate change in 2006; 64% believed that scientists disagreed about it "a lot." A 2007 Newsweek poll found these numbers were declining, although majorities of Americans still believed that scientists were uncertain about climate change and its causes.

Rush Holt wrote a piece for Science, which appeared in Newsweek:

For more than two decades scientists have been issuing warnings that the release of greenhouse gases, principally carbon dioxide (CO₂), is probably altering Earth's climate in ways that will be expensive and even deadly. The American public yawned and bought bigger cars. Statements by the American Association for the Advancement of Science, American Geophysical Union, American Meteorological Society, Intergovernmental Panel on Climate Change, and others underscored the warnings and called for new government policies to deal with climate change. Politicians, presented with noisy statistics, shrugged, said there is too much doubt among scientists, and did nothing.

Deliberate attempts by the Western Fuels Association "to confuse the public" have succeeded in their objectives. This has been "exacerbated by media treatment of the climate issue". According to a Pew poll in 2012, 57% of the US public are unaware of, or outright reject, the scientific consensus on climate change. Some organizations promoting climate change denial have asserted that scientists are increasingly rejecting climate change, but this notion is contradicted by research showing that 97% of published papers endorse the scientific consensus, and that percentage is increasing with time.

Social psychologist Craig Foster compares climate change denialists to flat-earth believers and the reaction to the latter by the scientific community. Foster states, "the potential and kinetic energy devoted to counter the flat-earth movement is wasteful and misguided ... I don't understand why anybody would worry about the flat-earth gnat while facing the climate change mammoth ... Climate change denial does not require belief. It only requires neglect."

In 2016, Aaron McCright argued that anti-environmentalism—and climate change denial specifically—has expanded to a point in the US where it has now become "a central tenet of the current conservative and Republican identity".

On the other hand, global oil companies have begun to acknowledge the existence of climate change and its risks. Still top oil firms are spending millions lobbying to delay, weaken or block policies to tackle climate change.

Manufactured climate change denial is also influencing how scientific knowledge is communicated to the public. According to climate scientist Michael E. Mann, "universities and scientific societies and organizations, publishers, etc.—are too often risk averse when it comes to defending and communicating science that is perceived as threatening by powerful interests".

Responses to denialism

Temperature data: Global average temperature datasets from various scientific organizations show substantial agreement concerning the progress and extent of global warming: pairwise correlations of 1850+/1880+ datasets exceed 99.1%.

Causation: The Fourth National Climate Assessment ("NCA4", USGCRP, 2017) includes charts illustrating how human factors, especially accumulation in the atmosphere of greenhouse gases, are the predominant cause of observed global warming.

The documentary The Great Global Warming Swindle received criticism from several experts. George Monbiot described it as "the same old conspiracy theory that we’ve been hearing from the denial industry for the past ten years". Similarly, in response to James Delingpole, Monbiot stated that his Spectator article was "the usual conspiracy theories about the 'powerful and very extensive body of vested interests' working to suppress the truth, which presumably now includes virtually the entire scientific community and everyone from Shell to Greenpeace and The Sun to Science". Some Australian meteorologists also weighed in, saying that the film made no attempt to offer a "critical deconstruction of climate science orthodoxies", but instead used various other means to suggest that climate scientists are guilty of lying or are seriously misguided. Although the film's publicist's asserted that "global warming is 'the biggest scam of modern times'", these meteorologists concluded that the film was "not scientifically sound and presents a flawed and very misleading interpretation of the science".

Former UK Secretary of State for Environment, Food and Rural Affairs David Miliband presented a rebuttal of the main points of the film and stated "There will always be people with conspiracy theories trying to do down the scientific consensus, and that is part of scientific and democratic debate, but the science of climate change looks like fact to me."

National Geographic fact-checked 6 persistent scientific conspiracy theories. Regarding the persistent belief in a global warming hoax they note that the Earth is continuing to warm and the rate of warming is increasing as documented in numerous scientific studies. The rise in global temperature and its rate of increase coincides with the rise of greenhouse gases in the atmosphere due to human activity. Moreover, global warming is causing Arctic sea ice to thaw at historic rates, many species of plants are blooming earlier than expected, and the migration routes of many birds, fish, mammals, and insects are changing.

The role of emotions and persuasive argument

Presenting data and other facts is less effective in motivating people to act to mitigate climate change, than financial incentives and social pressure involved in showing people climate-related actions of other people.

The strongest factors in self-reported changes in opinion about global warming were Republican party identification, seeing others experience impacts of global warming, and learning more about global warming.

Climate denial "is not simply overcome by reasoned argument", because it is not a rational response. Attempting to overcome denial using techniques of persuasive argument, such as supplying a missing piece of information, or providing general scientific education may be ineffective. A person who is in denial about climate is most likely taking a position based on their feelings, especially their feelings about things they fear.

Academics have stated that "It is pretty clear that fear of the solutions drives much opposition to the science."

It can be useful to respond to emotions, including with the statement "It can be painful to realise that our own lifestyles are responsible", in order to help move "from denial to acceptance to constructive action."

Writing about people who have changed their position

Some climate change skeptics have changed their positions regarding global warming. Ronald Bailey, author of Global Warming and Other Eco-Myths (published in 2002), stated in 2005, "Anyone still holding onto the idea that there is no global warming ought to hang it up." By 2007, he wrote "Details like sea level rise will continue to be debated by researchers, but if the debate over whether or not humanity is contributing to global warming wasn't over before, it is now.... as the new IPCC Summary makes clear, climate change Pollyannaism is no longer looking very tenable."

"I used to be a climate-change skeptic", conservative columnist Max Boot admitted in 2018, one who believed that "the science was inconclusive" and that worry was "overblown". Now, he says, referencing the Fourth National Climate Assessment, "the scientific consensus is so clear and convincing." Climate change doubter Bob Inglis, a former US representative for South Carolina, changed his mind after appeals from his son on his environmental positions, and after spending time with climate scientist Scott Heron studying coral bleaching in the Great Barrier Reef. Inglis lost his House race in 2010, and went on to found republicEn, a nonprofit promoting conservative voices and solutions on climate change.

Jerry Taylor promoted climate denialism for 20 years as former staff director for the energy and environment task force at the American Legislative Exchange Council (ALEC) and former vice president of the Cato Institute. Taylor began to change his mind after climate scientist James Hansen challenged him to reread some Senate testimony. He became President of the Niskanen Center in 2014, where he is involved in turning climate skeptics into climate activists, and making the business case for climate action.

In 2009, Russian president Dmitri Medvedev expressed his opinion that climate change was "some kind of tricky campaign made up by some commercial structures to promote their business projects". After the devastating 2010 Russian wildfires damaged agriculture and left Moscow choking in smoke, Medvedev commented, "Unfortunately, what is happening now in our central regions is evidence of this global climate change."

Michael Shermer, the publisher of Skeptic magazine, reached a tipping point in 2006 as a result of his increasing familiarity with scientific evidence, and decided there was "overwhelming evidence for anthropogenic global warming". Journalist Gregg Easterbrook, an early skeptic of climate change who authored the influential book A Moment on the Earth, also changed his mind in 2006, and wrote an essay titled "Case Closed: The Debate About Global Warming is Over". In 2006, he stated, "based on the data I'm now switching sides regarding global warming, from skeptic to convert."

Weather Channel senior meteorologist Stu Ostro expressed skepticism or cynicism about anthropogenic global warming for some years, but by 2010, he had become involved in explaining the connections between man-made climate change and extreme weather.

Richard A. Muller, professor of physics at the University of California, Berkeley, and the co-founder of the Berkeley Earth Surface Temperature project, funded by Charles Koch Charitable Foundation, has been a prominent critic of prevailing climate science. In 2011, he stated that "following an intensive research effort involving a dozen scientists, I concluded that global warming was real and that the prior estimates of the rate of warming were correct. I'm now going a step further: Humans are almost entirely the cause."

Effective approaches to dialogue

Explaining the techniques of science denial and misinformation, by presenting "examples of people using cherrypicking or fake experts or false balance to mislead the public", has been shown to inoculate people somewhat against misinformation.

Dialogue focused on the question of how belief differs from scientific theory may provide useful insights into how the scientific method works, and how beliefs may have strong or minimal supporting evidence. Wong-Parodi's survey of the literature shows four effective approaches to dialogue, including "[encouraging] people to openly share their values and stance on climate change before introducing actual scientific climate information into the discussion."

Approaches with farmers

One study of climate change denial among farmers in Australia found that farmers were less likely to take a position of climate denial if they had experienced improved production from climate-friendly practices, or identified a younger person as a successor for their farm. Therefore, seeing positive economic results from efforts at climate-friendly agricultural practices, or becoming involved in intergenerational stewardship of a farm may play a role in turning farmers away from denial.

In the United States, rural climate dialogues sponsored by the Sierra Club have helped neighbors overcome their fears of political polarization and exclusion, and come together to address shared concerns about climate impacts in their communities. Some participants who start out with attitudes of anthropogenic climate change denial have shifted to identifying concerns which they would like to see addressed by local officials.

Statements of well known people

In May 2013 Charles, Prince of Wales took a strong stance criticising both climate change deniers and corporate lobbyists by likening the Earth to a dying patient. "A scientific hypothesis is tested to absolute destruction, but medicine can't wait. If a doctor sees a child with a fever, he can't wait for [endless] tests. He has to act on what is there."

See also

• Agnotology
• Anti-environmentalism
• CO2 Coalition – advocacy organization whose claims conflict with the scientific consensus
• Environmental skepticism
• Global warming controversy
• Media coverage of climate change
• Motivated reasoning
• Political activities of the Koch family
• Renewable energy commercialization: Non-technical barriers to acceptance
• Right-wing antiscience
• Semmelweis reflex
• Skeptical Science - website to counter arguments by global warming deniers
• Tobacco industry playbook
• Films:
  • Climate Change Denial Disorder, satirical parody film about a fictional disease
  • Before the Flood, documenting climate change denial and lobbying processes

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