Warming stripes (sometimes referred to as climate stripes,[Note 1] climate timelines or stripe graphics) are data visualization graphics that use a series of coloured stripes chronologically ordered to visually portray long-term temperature trends.[Note 2] Warming stripes reflect a "minimalist" style, conceived to use colour alone to avoid technical distractions and intuitively convey global warming trends to non-scientists.
The initial concept of visualizing historical temperature data has been extended to involve animation, to visualize sea level rise and predictive climate data, and to visually juxtapose temperature trends with other data such as atmospheric CO2 concentration, global glacier retreat, precipitation, and progression of ocean depths.
Background, publication and content
In May 2016, to make visualizing climate change easier for the general public, University of Reading climate scientist Ed Hawkins created an animated spiral graphic of global temperature change as a function of time, a representation said to have gone viral. Jason Samenow wrote in The Washington Post that the spiral graph was "the most compelling global warming visualization ever made", before it was featured in the opening ceremony of the 2016 Summer Olympics. Then, on 22 May 2018, Hawkins published graphics constituting a chronologically ordered series of coloured vertical stripes that he called warming stripes. Hawkins, a lead author for the IPCC 6th Assessment Report, received the Royal Society's 2018 Kavli Medal, in part "for actively communicating climate science and its various implications with broad audiences".
As described in a BBC article, in the month the big meteorological agencies release their annual climate assessments, Hawkins experimented with different ways of rendering the global data and "chanced upon the coloured stripes idea". When he tried out a banner at the Hay Festival, according to the article, Hawkins "knew he'd struck a chord". The National Centre for Atmospheric Science (U.K.), with which Hawkins is affiliated, states that the stripes "paint a picture of our changing climate in a compelling way. Hawkins swapped out numerical data points for colours which we intuitively react to".
Warming stripe graphics are reminiscent of colour field painting, a style prominent in the mid 20th century, which strips out all distractions and uses only colour to convey meaning. Colour field pioneer artist Barnett Newman said he was "creating images whose reality is self-evident", an ethos that Hawkins is said to have applied to the problem of climate change.
Collaborating with Berkeley Earth scientist Robert Rohde, on 17 June 2019 Hawkins published for public use, a large set of warming stripes on ShowYourStripes.info. Individualized warming stripe graphics were published for the globe, for most countries, as well as for certain smaller regions such as states in the US or parts of the UK, since different parts of the world are warming more quickly than others.
Data sources and data visualization
Warming stripe graphics are defined with various parameters, including:
- source of dataset (meteorological organization)
- measurement location (global, country, state, etc.)
- time period (year range, for horizontal "axis")
- temperature range (range of anomaly (deviation) about a reference or baseline temperature)
- colour scale (assignment of colours to represent respective ranges of temperature anomaly), and
- colour choice (shades of blue and red), as well as
- temperature boundaries (temperature above which a stripe is red and below which is blue, determined by an average annual temperature over a "reference period" or "baseline" of usually 30 years).
Hawkins' original graphics[Note 4] use the eight most saturated blues and reds from the ColorBrewer 9-class single hue palettes, which optimize colour palettes for maps and are noted for their colourblind-friendliness. Hawkins said the specific colour choice was an aesthetic decision ("I think they look just right"), also selecting baseline periods to ensure equally dark shades of blue and red for aesthetic balance.
A Republik analysis said that "this graphic explains everything in the blink of an eye", attributing its effect mainly to the chosen colors, which "have a magical effect on our brain, (letting) us recognize connections before we have even actively thought about them". The analysis concluded that colors other than blue and red "don't convey the same urgency as (Hawkins') original graphic, in which the colors were used in the classic way: blue=cold, red=warm."
ShowYourStripes.info cites dataset sources Berkeley Earth, NOAA, UK Met Office, MeteoSwiss, DWD (Germany), specifically explaining that the data for most countries comes from the Berkeley Earth temperature dataset, except that for the US, UK, Switzerland & Germany the data comes from respective national meteorological agencies.
For each country-level #ShowYourStripes graphic (Hawkins, June 2019), the average temperature in the 1971-2000 reference period is set as the boundary between blue (cooler) and red (warmer) colours, the colour scale varying +/- 2.6 standard deviations of the annual average temperatures between 1901 and 2000. Hawkins noted that the graphic for the Arctic "broke the colour scale" since it is warming more than twice as fast as the global average.
For statistical and geographic reasons, it is expected that graphics for small areas will show more year-to-year variation than those for large regions. Year-to-year changes reflected in graphics for localities result from weather variability, whereas global warming over centuries reflects climate change.
The NOAA website warns that the graphics "shouldn't be used to compare the rate of change at one location to another", explaining that "the highest and lowest values on the colour scale may be different at different locations". Further, a certain colour in one graphic will not necessarily correspond to the same temperature in other graphics.
A climate change denier generated a warming stripes graphic that misleadingly affixed Northern Hemisphere readings over one period to global readings over another period, and omitted readings for the most recent thirteen years, with some of the data being 29-year-smoothed—to give the false impression that recent warming is routine. Calling the graphic "imposter warming stripes", meteorologist Jeff Berardelli described it in January 2020 as "a mishmash of data riddled with gaps and inconsistencies" with an apparent objective to confuse the public.
Applications and influence
After Hawkins' first publication of warming stripe graphics in May 2018, broadcast meteorologists in multiple countries began to show stripe-decorated neckties, necklaces, pins and coffee mugs on-air, reflecting a growing acceptance of climate science among meteorologists and a willingness to communicate it to audiences. In 2019, the United States House Select Committee on the Climate Crisis used warming stripes in its committee logo, showing horizontally oriented stripes behind a silhouette of the United States Capitol, and three U.S. Senators wore warming stripe lapel pins at the 2020 State of the Union Address.
On 17 June 2019, Hawkins initiated a social media campaign with hashtag #ShowYourStripes that encourages people to download their regions' graphics from ShowYourStripes.info, and to post them. The campaign was backed by U.N. Climate Change, the World Meteorological Organization and the Intergovernmental Panel on Climate Change. Called "a new symbol for the climate emergency" by French magazine L'EDN, warming stripes have been applied to knit-it-yourself scarves, a vase neckties, cufflinks, vehicles, and a music festival stage, as well as on the side of Freiburg, Germany, streetcars, as municipal murals in Córdoba, Spain, and Anchorage, Alaska, a mural at the Cottbus, Germany train station, on face masks during the COVID-19 pandemic, in an action logo of the German soccer club 1. FSV Mainz 05, on the side of the Climate Change Observatory in Valencia, on tech-themed shirts, and on designer dresses. Remarking that "infiltrating popular culture is a means of triggering a change of attitude that will lead to mass action", Hawkins surmised that making the graphics available for free has made them used more widely. Hawkins further said that any merchandise-related profits are donated to charity.
Through a campaign led by nonprofit Climate Central using hashtag #MetsUnite, more than 100 TV meteorologists—the scientists most laymen interact with more than any other—featured warming stripes and used the graphics to focus audience attention during broadcasts on summer solstices beginning in 2018 with the "Stripes for the Solstice" effort.
In 2018, the German Weather Service's meteorological training journal Promet showed a warming stripes graphic on the cover of the issue titled "Climate Communication". By September 2019, the Met Office, the U.K.'s national weather service, was using both a climate spiral and a warming stripe graphic on its "What is climate change?" webpage. Concurrently, the cover of the 21–27 September 2019 issue of The Economist, dedicated to "The climate issue," showed a warming stripe graphic, as did the cover of The Guardian on the morning of the 20 September 2019 climate strikes. The environmental initiative Scientists for Future (2019) included warming stripes in its logo. The Science Information Service (Germany) noted in December 2019 that warming stripes were a "frequently used motif" in demonstrations by the School strike for the climate and Scientists for Future, and were also on the roof of the German Maritime Museum in Bremerhaven. Also in December 2019, Voilà Information Design said that warming stripes "have replaced the polar bear on a melting iceberg as the icon of the climate crisis". On 18 January 2020, a 20-metre-wide artistic light-show installation of warming stripes was opened at the Gendarmenmarkt in Berlin, with the Berlin-Brandenburg Academy of Sciences building being illuminated in the same way. The cover of the "Climate Issue" (fall 2020) of the Space Science and Engineering Center's Through the Atmosphere journal was a warming stripes graphic, and in June 2021 the WMO used warming stripes to "show climate change is here and now" in its statement that "2021 is a make-or-break year for climate action".
On 27 September 2019, the Fachhochschule (University of Applied Science) Potsdam announced that warming stripes graphics had won in the science category of an international competition recognising innovative and understandable visualisations of climate change, the jury stating that the graphics make an "impact through their innovative, minimalist design".
Extensions of warming stripes
In 2018, University of Reading post-doctoral research assistant Emanuele Bevacqua juxtaposed vertical-stripe graphics for CO2 concentration and for average global temperature (August), and "circular warming stripes" depicting average global temperature with concentric coloured rings (November).
In March 2019, German engineer Alexander Radtke extended Hawkins' historical graphics to show predictions of future warming through the year 2200, a graphic that one commentator described as making the future "a lot more visceral". Radtke bifurcated the graphic to show diverging predictions for different degrees of human action in reducing greenhouse gas emissions.
On or before 30 May 2019, U.K.-based software engineer Kevin Pluck designed animated warming stripes that portray the unfolding of the temperature increase, allowing viewers to experience the change from an earlier stable climate to recent rapid warming.
By June 2019, Hawkins vertically stacked hundreds of warming stripe graphics from corresponding world locations and grouped them by continent to form a comprehensive, composite graphic, "Temperature Changes Around the World (1901-2018)".
On 1 July 2019, Durham University geography research fellow Richard Selwyn Jones published a Global Glacier Change graphic, modeled after and credited as being inspired by Hawkins' #ShowYourStripes graphics, allowing global warming and global glacier retreat to be visually juxtaposed. Jones followed on 8 July 2019 with a stripe graphic portraying global sea level change using only shades of blue. Separately, NOAA displayed a graphic juxtaposing annual temperatures and precipitation, and researchers from the Netherlands used stripe graphics to represent progression of ocean depths.
Some warned that warming stripes of individual countries or states, taken out of context, could advance the idea that global temperatures are not rising, though research meteorologist J. Marshall Shepherd said that "geographic variations in the graphics offer an outstanding science communication opportunity". Meteorologist and #MetsUnite coordinator Jeff Berardelli said that "local stripe visuals help us tell a nuanced story—the climate is not changing uniformly everywhere".
Others say the charts should include axes or legends, though the website FAQ page explains the graphics were "specifically designed to be as simple as possible, and to start conversations... (to) fill a gap and enable communication with minimal scientific knowledge required to understand their meaning". J. Marshall Shepherd, former president of the American Meteorological Society, lauded Hawkins' approach, writing that "it is important not to miss the bigger picture. Science communication to the public has to be different" and commending Hawkins for his "innovative" approach and "outstanding science communication" effort.
In The Washington Post, Matthew Cappucci wrote that the "simple graphics ... leave a striking visual impression" and are "an easily accessible way to convey an alarming trend", adding that "warming tendencies are plain as day". Greenpeace spokesman Graham Thompson remarked that the graphics are "like a really well-designed logo while still being an accurate representation of very important data".
CBS News contributor Jeff Berardelli noted that the graphics "aren't based on future projections or model assumptions" in the context of stating that "science is not left or right. It's simply factual."
A September 2019 editorial in The Economist hypothesized that "to represent this span of human history (1850-2018) as a set of simple stripes may seem reductive"—noting those years "saw world wars, technological innovation, trade on an unprecedented scale and a staggering creation of wealth"—but concluded that "those complex histories and the simplifying stripes share a common cause," namely, fossil fuel combustion.
- Climate change
- Climate change art
- Climate spiral
- Environmental communication
- Scientific consensus on climate change
- The Tempestry Project
- In his "Climate stripes for the U.K." Climate Lab Book entry (17 Sept 2018), Ed Hawkins implicitly applied the generic term "climate stripes" to both temperature and rainfall graphics, reserving the more specific term "warming stripes" to the temperature graphic.
- More precisely: a warming stripes graphic generally portrays temperature anomalies, which are deviations below or above a chosen reference or baseline temperature.
- Typically, warming stripe graphics portray temperature anomalies—usually, deviations from an average temperature over a chosen reference period (baseline)—and not absolute temperatures. Also, different graphics' colours may cover different-size temperature ranges (e.g., 0.10° C per colour vs. 0.15° C per colour). Accordingly, a particular colour in one graphic does not necessarily represent the same absolute temperature or temperature anomaly as the same colour in another graphic.
- In this Wikipedia article, most figures do not follow Hawkins' exact colour choice, as those figures were generated before the nature of Hawkins' chosen colour palette was widely publicized.
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(Google translate:) Whether global or local - the climatic stripes have managed to make an impact through their innovative, minimalist design and convey a message that is still urgent.
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|Wikimedia Commons has media related to Warming stripes.|
- ShowYourStripes.info — warming stripes portraying historical data for multiple locations
- Hawkins, Ed (20 September 2019). "The story behind the viral graphic that electrified the climate movement". Fast Company. Archived from the original on 21 September 2019.
- Rennie, Jared. "Annual United States Climate Stripes: Temperature and Precipitation". ArcGIS. North Carolina State University. — clickable map of warming stripes for each county in 48 contiguous U.S. states
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