|This article's factual accuracy may be compromised due to out-of-date information. (July 2011)|
|Purpose/focus||cut CO2 emissions and build a global movement for climate solutions|
|Headquarters||Berkeley, California, USA|
350.org is an international environmental organization, headed by author Bill McKibben, with the goal of building a global grassroots movement to raise awareness of anthropogenic climate change, to confront climate change denial, and to cut emissions of one of the greenhouse gases, carbon dioxide, in order to slow the rate of global warming. 350.org takes its name from the research of Goddard Institute for Space Studies scientist James E. Hansen, who posited in a 2007 paper that 350 parts-per-million (ppm) of CO2 in the atmosphere is a safe upper limit to avoid a climate tipping point.
The organization was founded by author Bill McKibben, an American environmentalist and writer who frequently writes about global warming, alternative energy, and the need for more localised economies. McKibben promotes the organisation, for instance by writing articles about it for many major newspapers and media, such as the Los Angeles Times and The Guardian.
The organising effort drew its name from climate scientist James Hansen's contention in winter 2008 that any atmospheric concentration of CO2 above 350 parts per million was unsafe. James Hansen opined that "if humanity wishes to preserve a planet similar to that on which civilization developed and to which life on Earth is adapted, paleoclimate evidence and ongoing climate change suggest that CO2 will need to be reduced from its current 385 ppm to at most 350 ppm, but likely less than that." Carbon dioxide, the main greenhouse gas, rose by 2.3 parts per million to 389 ppm in 2010 from the previous year, and continued to increase with January 2012 atmospheric CO2 concentration at 393.09 and crossed 400 ppm on monitors in May 2012 in the industrialized Northern Hemisphere's Arctic region.
McKibben first started to organize against global warming with a walk across Vermont, his home state. His "Step It Up" campaign in 2007 involved 1,400 demonstrations at famous sites across the United States. McKibben credits these activities with making Hillary Clinton and Barack Obama change their energy policies during the presidential campaign. Later, he started 350.org.
Rajendra Pachauri, the U.N.'s "top climate scientist" and leader of the Intergovernmental Panel on Climate Change (IPCC) has come out in favor of reducing atmospheric concentrations of carbon dioxide to 350 ppm. McKibben called news of Pachauri's embrace of the 350ppm target "amazing". Some media have indicated that Pachauri's endorsement of the 350 ppm target was a victory for 350.org's activism.
The 350 movement is treating the 350ppm cap as a rallying cry for a 2009 COP15 international treaty. 350 member Alec Appelbaum stated that "We need global compacts to enforce carbon caps, because emissions change the climate whether or not they come from regulated sources. But we also need ingenious businesses to make those caps meaningful. That’s true because no matter how severely we warp the climate, we have to go on living." The overall goal is to influence governments to adopt policies that would lower carbon dioxide emissions.
International Day of Climate Action 
An "International Day of Climate Action" on October 24, 2009, was organized by 350.org to influence the delegates going to the United Nations Framework Convention on Climate Change meeting in December, 2009 (COP15). This was the first global campaign ever organized around a scientific data point. The actions organised by 350.org included gigantic depictions of the number "350", walks, marches, rallies, teach-ins, bike rides, sing-a-thons, carbon-free dinners, retrofitting houses to save energy, tree plantings, mass dives at the Great Barrier Reef, solar-cooked bake-outs, churches bell ringings, underwater cabinet meetings (Maldives), and armband distributions to athletes. The organization reported that over 5,200 synchronized demonstrations occurred in 181 countries on the day. The group reports that they organised the world's "most widespread day of political action" on Saturday October 24, 2009, reporting 5,245 actions in 181 countries.
10/10/10 Global Work Party 
As a follow-up to 2009's International Day of Climate Action, 350.org and the 10:10 campaign joined to help coordinate another global day of action which occurred on October 10, 2010. The 2010 campaign is focused on concrete actions that can be taken locally to help combat climate change. Actions from tree-plantings to solar panel installations to huge electricity service-provider switching parties occurred in almost every country around the world.
Connect the Dots 5.May.2012 
The organization's efforts continued into 2012 with a planned May 5 worldwide series of rallies under the slogan “Connect the Dots,” to draw attention to the links between climate change and extreme weather. Per the 350.org website the day is called Climate Impacts Day.
General activities 
Apart from special events, 350.org organises actions on an ongoing basis to promote its message. These activities include tree plantings (350 trees in each instance) for biosequestration, promoting the term "350", publishing adverts in major newspapers calling for the target level of carbon dioxide to be lowered to 350ppm, conducting polls on the subject of climate change, educating youth leaders, lobbying governments on the issue of carbon targets, and joining a campaign to establish a .eco top-level domain or "tld". In December 2009, the group petitioned the United States Environmental Protection Agency to set national limits for greenhouse gases using the Clean Air Act, asking the agency to cap atmospheric concentrations of carbon dioxide at 350 parts per million. The organization created and distributed a time-lapse video showing the recent retreat of Mendenhall Glacier in Alaska, graphically depicting the impacts of warming climates. On President's Day, February 18, 2013, it is co-organizing a national day of action to call on President Obama to address climate change.
350.org claims alliance with 300 organisations around the world and has enlisted "350 messengers" who have publicly allied themselves with the organisation or its goal to spread the 350 movement, including Archbishop Desmond Tutu, Alex Steffen, Bianca Jagger, David Suzuki, and Colin Beavan.
In a New York Times article climate scientist Gavin Schmidt questions whether it is meaningful to raise awareness by promoting a certain goal number for the concentration of carbon dioxide in the atmosphere. He later on clarifies on the RealClimate blog that his statement was not meant as a criticism of the movement itself.
See also 
- 10:10 (climate change campaign)
- 2010 United Nations Climate Change Conference
- Air pollution reduction efforts
- Climate change mitigation
- Climate change policy of the United States
- Conservation (ethic)
- Environmental movement
- Individual and political action on climate change
- List of environmental issues
- Politics of global warming
- Stern Review
- On the 350.org website they identify themselves in their mission statement as 350.org rather than 350. They state: "350.org is an international campaign dedicated to building a movement to unite the world around solutions to the climate crisis--the solutions that science and justice demand."
- In a Mother Jones article, it states that "350.org is an international organization calling everyday citizens to action with the belief that raising awareness around the number 350 will put pressure on world leaders to aggressively address climate change, causing a paradigm shift in how individual countries approach a global problem."
- In an Otago Daily Times article, 350.org is described as "an environmental organisation which is trying to reduce the concentration of carbon dioxide, a greenhouse gas (for reference see example Gilbert Plass Scientific American July 1959 article), in the atmosphere from more than 385 parts per million to 350 parts per million."
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