2021 in climate change

List of years in climate change
+...
For information on meteorology in 2021, see Meteorology in the 21st century § 2021.

This article documents events, research findings, scientific and technological advances, and human actions to measure, predict, mitigate, and adapt to the effects of global warming and climate change—during the year 2021.

Summaries

[edit]
2021 is a make or break year...

     ... to confront the global climate emergency. ... Today's interim report from the UNFCCC[1] shows governments are nowhere close to the level of ambition needed to limit climate change to 1.5 degrees and meet the goals of the Paris Agreement. The major emitters must step up with much more ambitious emissions reductions targets for 2030 in their Nationally Determined Contributions well before the November (2021) UN Climate Conference.[2]

UN Secretary-General António Guterres, 26 February 2021
  • 26 February: The United Nations Synthesis Report on Nationally Determined Contributions under the Paris Agreement stated that "estimated reductions referred to in paragraphs (on greenhouse gas emissions) fall far short of what is required, demonstrating the need for Parties to further strengthen their mitigation commitments under the Paris Agreement".[1]
  • 21 June: the World Meteorological Organization wrote that "2021 is a make-or-break year for climate action, with the window to prevent the worst impacts of climate change—which include ever more frequent more intense droughts, floods and storms—closing rapidly."[3]
  • 28 July: a follow-on to the 2019 World Scientists' Warning of a Climate Emergency[4] noted "an unprecedented surge in climate-related disasters since 2019" and stated there is "mounting evidence that we are nearing or have already crossed tipping points associated with critical parts of the Earth system".[5]
  • 6 September: editors from over 200 health journals published a joint editorial stating "The science is unequivocal; a global increase of 1.5 °C above the pre-industrial average and the continued loss of biodiversity risk catastrophic harm to health that will be impossible to reverse.... The greatest threat to global public health is the continued failure of world leaders to keep the global temperature rise below 1.5 °C and to restore nature."[6]
  • 30 September: UN Secretary-General António Guterres stated that "time is running out. Irreversible climate tipping points lie alarmingly close." He called for more ambition as current NDCs will lead to a rise of 2.7 °C, saying that "all leaders must recognize that we are in the middle of a climate emergency".[7]

Measurements and statistics

[edit]
"Vital Signs of the Planet" as presented by NASA on 31 December 2021[8]
  • 25 January: a review article published in The Cryosphere reported that Earth lost 28 trillion tonnes of ice between 1994 and 2017, 68% being from atmospheric melting and 32% by oceanic melting.[9] The rate of ice loss rose 57% since the 1990s–from 0.8 to 1.2 trillion tonnes per year–raising global sea level 34.6 ±3.1 mm in that time period.[9]
  • 9 February: a study published in Environmental Research concluded that airborne fine particulate matter (PM2.5) caused by burning fossil fuels causes 8.7 million premature deaths annually, including China (2.4 million), India (2.5 million) and parts of eastern US, Europe and Southeast Asia.[10]
  • 16 February: study results published in the PNAS (study's time period: 1990–2018) reported widespread advances and lengthening of pollen seasons (up to 20 days) and increases in pollen concentrations (up to 21%) across North America, with human forcing of the climate system contributing about 50% of the trend in pollen seasons and about 8% of the trend in pollen concentrations.[11]
  • Atlantic meridional overturning circulation (AMOC):
  • 25 February: a Nature Geoscience article reported an "unprecedented" (since AD 400) decline in the twentieth century of the Atlantic meridional overturning circulation (AMOC), which is now in its weakest state in more than 1,000 years.[12] The AMOC redistributes heat on the planet and has a major impact on climate.[12] In particular, weakness in the AMOC, which includes the Florida Current and the Gulf Stream, counteracts its moderating effect on the climate in Europe.[13]
  • 5 August: a study published in Nature Climate Change presented "spatially consistent empirical evidence that, in the course of the last century, the AMOC may have evolved from relatively stable conditions to a point close to a critical transition".[14]
  • February: measurements from Mauna Loa Observatory showed that, for the first time, atmospheric CO2 levels reached 417 parts per million (ppm), a concentration 50% higher than the 278ppm pre-industrial level.[15]
  • 8 March: a study published in Nature Climate Change—studying the combined effects of average global sea level rise and natural and human-induced subsidence—estimated that subsiding coastal locations[Note 1] may locally experience up to four times more relative sea level rise than could be attributed to global sea level rise alone.[16]
  • 17 March: a study by the International Federation of Red Cross and Red Crescent Societies estimated that, globally between September 2020 and February 2021, 12.5 million people were displaced by adverse impacts of climate change, the annual average exceeding 20 million.[17]
  • 17 March: a study published in Nature estimated that trawling's disturbance of carbon stored in sea beds can re-mineralize sedimentary carbon into CO2 amounts equivalent to 15–20% of the atmospheric CO2 absorbed by the ocean each year, and comparable to that of terrestrial farming.[18]
  • 18 March: a study accepted for publication in Environmental Research Letters estimated that the severity of heatwave and drought impacts on crop production in Europe roughly tripled over the preceding 50 years, from –2.2 (1964–1990) to -7.3% (1991–2015).[19]
  • 1 April: a study published in Nature Climate Change estimated that anthropogenic climate change has reduced global agricultural total factor productivity by about 21% since 1961, and 26–34% in warmer regions such as Africa, Latin America and the Caribbean.[20]
  • 7 April: NOAA reported carbon dioxide levels were higher than at anytime in the past 3.6 million years, in the Mid-Pliocene Warm Period when sea level was about 24 mm (78 ft) higher than today and the average temperature was about 4 °C (7 °F) higher than in pre-industrial times.[21]
  • NOAA's redefinition of "average" and "normal":
  • April: NOAA's Climate Prediction Center (CPC) states it will use 1991–2020 as the new 30-year period of record, with "average" numbers of named Atlantic storms rising from 12 to 14, hurricanes from 6 to 7, and major hurricanes remaining at 3; Eastern Pacific and Central Pacific numbers remain unchanged over 1981–2010.[22]
  • May: NOAA's NCEI supersedes weather and climate data from 1981–2010 with data from 1991–2020 to change its designation of "Climate Normal", resulting in fewer days being characterized as having "above normal" temperature.[23]
  • 28 April: a study published in Nature attributed 21±3% of the observed sea-level rise from 2000–2019 to melting glaciers (267±16 gigatonnes per year), and identified a mass loss acceleration of 48±16 gigatonnes per year per decade.[24]
  • 11 May: a study published in Nature Communications estimated that land use change affected 32% of the global land area from 1960 to 2019, about four times greater than previously estimated.[25]
  • 20 May: The Arctic Monitoring and Assessment Programme reported that, from 1971 to 2019, the annually averaged Arctic near-surface air temperature increased by 3.1 °C, three times faster than the global average.[26]
  • 21 May: a study published in Geophysical Research Letters reported that, despite greater raw warming in high latitudes, the tropics have greater normalized warming and actually experienced more record-breaking heat events from 1960 to 2019.[27]
  • 24 May: a study published in Nature Geoscience reported mercury in Greenland ice sheet meltwater being two orders of magnitude higher than from Arctic rivers, and, accounting for about 10% of the estimated global riverine flux, estimated it to be globally significant.[28]
  • 31 May: a study published in Nature Climate Change concluded that 37% of warm-season heat-related deaths from 1991 to 2018 can be attributed to anthropogenic climate change and that increased mortality is evident on every continent.[29]
  • 4 June: a study published in Science Advances concluded that previous estimates of CO2 emissions caused by human cultivation of peatlands from 1750 to 2018 should be increased by 18% to account for emissions from cultivated northern peatlands in calculating the carbon budget.[30]
  • 15 June: a study accepted for publication in Geophysical Research Letters reported that satellite and in situ observations independently show an approximate doubling of Earth's Energy Imbalance (EEI) from mid-2005 to mid-2019.[31]
  • 28 July: a study published in Nature Communications revealed a significant positive global energy imbalance based on satellite observations from 2001 to 2020, and concluded that there is less than 1% probability that this imbalance can be explained by natural internal variability of the climate system.[32]
In 2021, wind and solar power reached a record 10% of global electricity.[33] Shown: 20 leading countries.[34]
  • 31 August: the WMO published an Atlas of Mortality and Economic Losses from Weather, Climate and Water Extremes (1970–2019), indicating that the number of disasters has increased by a factor of five, driven by climate change, more extreme weather and improved reporting; but because of improved early warnings and disaster management the number of deaths decreased almost three-fold.[35]
  • 1 September: a study published in Nature found that since 2001, fires in the Amazon rainforest had potentially impacted ranges of 77.3–85.2% of threatened species in the region, reducing the biodiversity that contributes to the ecological and climatic stability of the Amazon Basin.[36]
  • 12 October: a study published in the Proceedings of the NAS estimated a nearly 200% increase in urban heat extremes among 13,115 urban areas from 1983 to 2016.[37]
  • October: The Global Coral Reef Monitoring Network's Status of Coral Reefs of the World reported that "between 2009 and 2018, there was a progressive loss amounting to 14% of the coral from the world's coral reefs, which is more than all the coral currently living on Australia's coral reefs".[38]
  • 30 March 2022: Ember's Global Electricity Review reported that in 2021, wind and solar power reached a record 10% of global electricity, with clean power being 38% of supply, more than coal's 36%.[33] However, demand growth rebounded, leading to a record rise in coal power and emissions.[33]
  • 7 April 2022: NOAA reported an annual increase in global atmospheric methane of 17 parts per billion (ppb) in 2021—averaging 1,895.7 ppb in that year—the largest annual increase recorded since systematic measurements began in 1983.[39] The increase during 2020 was 15.3 ppb, itself a record increase.[39]

Natural events and phenomena

[edit]
  • 7 February: a rock-ice avalanche in the Chamoli district in the Indian Himalayan Mountains killed dozens and left hundreds missing.[40][Note 2] The death count grew to 204, with 27 million cubic meters of rock and ice collapsing.[41][Note 3]
  • March: a Science Brief review of >90 peer-reviewed scientific articles reported consensus that ocean warming from human-induced climate change is likely fueling more powerful tropical cyclones[Note 4] with increased precipitation rates (through enhanced atmospheric moisture), the increased power and rising sea levels amplifying flooding.[42] Models project that some regions will experience increases in rapid intensification, a poleward migration of the latitude of maximum intensity or a slowing of the forward motion of the storms.[42] Most climate model studies project the annual number of tropical cyclones to decrease or remain approximately the same.[42]
A Remarkable Year for Earth's Climate
  • 2021 was consistent with the long-term human-caused global warming trend of about 0.2 °C (0.36 °F) per decade.
  • From India to England, Russia, China, New Zealand, the U.S., Indonesia, Uganda, Germany, ... extreme precipitation and flooding over the span of just a few months.
  • Extreme heat waves punished Japan, Ireland, Turkey, western North America, and England. The record-shattering extreme heatwave in the Pacific Northwest likely killed more than 1,000 people.
  • Western North America, Siberia, and the Mediterranean region experienced intense droughts.
Dana Nuccitelli
Yale Climate Connections[43]
  • 5 March: an article published in Science concluded that the Atlantic Multidecadal Oscillation is not an internal multidecadal (40- to 60-year) oscillation distinct from climate noise, but is instead a manifestation of competing time-varying effects of anthropogenic greenhouse gases and sulfate aerosols.[44]
  • 11 March: a review article published in Frontiers in Forests and Global Change concluded that warming from non-CO2 agents (especially CH4 and N2O) in the Amazon basin largely offsets—and most likely exceeds—the climate change mitigating effect of the region's CO2 uptake.[45]
  • 22 March: a study published in Geophysical Research Letters concluded that accelerated decline in terrestrial water storage (TWS) caused by glacial ice melting was the main driver of a rapid eastward drift of the geographic north pole after the 1990s.[46]
  • 26 March: the full bloom date of cherry blossoms in Kyoto, Japan—when the majority of buds are open to the skies—occurred earlier than any time since records began in the year 812 CE; historically, the bloom date occurs about 17 April.[47]
  • 9 April: a study published in Nature Communications citing multiple complementary lines of evidence, reported methane-oxidising bacteria (MOB) dwelling in the bark of Melaleuca quinquenervia (a paper bark tree common in Australia) reduced methane emissions by 36±5%.[48]
  • 13 April: a study of fruitflies published in Nature Communications found that the temperature at which male fertility is lost is much lower than critical thermal limits (CTLs) for survival, suggesting that species, especially tropical species, are more vulnerable to extinction than previously presumed, and that evolution and plasticity are unlikely to rescue populations from extinction.[49]
  • 16 April: Science published results of a study of boreal forests, concluding that forest fires shifted tree dominance from slow-growing black spruce to fast-growing deciduous broadleaf trees, resulting in a net increase in carbon storage and suggesting potential mitigation of the feedback effect of boreal forest fires to global warming.[50]
  • 17 April: winds of Typhoon Surigae rapidly intensified by 170 km/h (105 mph) in 36 hours to reach 306 km/h (190 mph),[51] becoming the strongest tropical cyclone of 2021 worldwide.[52]
  • 14 June: a study published in the Proceedings of the National Academy of Sciences concluded that Rocky Mountain subalpine forests are burning more than at any point in the past 2,000 years, with contemporary rates of burning being 22% higher than the maximum rate reconstructed over the past two millennia.[53]
  • 18 June: a study published in Nature Communications—accounting for sea level rise, storm surge, and wave runup at exposed open coasts—estimated that globally aggregated annual overtopping hours had increased by almost 50% over the preceding two decades.[54]
  • Late June: the 2021 Western North America heat wave set a new all-time Canadian temperature record of 49.6 °C (121.28 °F), World Weather Attribution concluding that heat waves of such intensity would be at least 150 times rarer without human-induced climate change.[55]
  • 14 July: a study published in Nature found that the intensification of the dry season and an increase in deforestation seem to promote higher carbon emissions in the eastern Amazon, in line with studies that indicate an increase in tree mortality as a result of climatic changes across Amazonia.[56]
  • 10 August: studying the 2020 heat wave in Siberia, a study published in the PNAS suggested that gas hydrates trapped in carbonate rock formations became unstable, possibly "add(ing) unknown quantities of methane to the atmosphere in the near future"—in addition to that long known to be produced from microbial decay of organic matter.[57]
  • 14 August: the >3000 m peak of the Greenland ice sheet experienced rain for the first known time in recorded history, in one of nine instances in the past 2,000 years in which the temperature exceeded the freezing point.[58]
  • 2 March 2023: a study published in Science said that boreal fires, typically accounting for 10% of global fire CO2 emissions, contributed 23% in 2021, by far the highest fraction since 2000.[59] 2021 was an abnormal year because North American and Eurasian boreal forests synchronously experienced their greatest water deficit.[59]

Actions, and goal statements

[edit]

Science and technology

[edit]
  • 8 February: XPrize announced a competition to bestow its largest-ever prize, $100 million donated by Elon Musk to be awarded in 2025, for technology to remove carbon from air or water.[60] Winning entries must show an ability to scale up to removing billions of metric tons of carbon.[60]
  • February: Porsche announced trials to start in 2022 to develop synthetic fuel that it claims will have the same "well to wheel impact"—CO2 produced throughout manufacture and sale—as electric vehicles.[61]
  • February and earlier: Aptera Motors indicated it would produce in 2021 a three-wheel, highly aerodynamic electric vehicle powered by 34 square feet of solar cells, also having rechargeable batteries.[62]
  • Late February: a Cambridge University study estimated that bitcoin mining energy consumption—at that time on the order of 100 terawatt-hours annually—possessed a carbon footprint equivalent to Argentina's, a figure likely increased by interest in bitcoin in early 2021 from major Wall Street institutions.[63]
  • March: The Guardian reported on the design of "Vortex Bladeless", a curved-top cylindrical turbine whose main body oscillates resonantly with the wind to generate electricity, the design occupying a much smaller footprint than blade-driven wind turbines.[64]
  • 18 March: a feasibility study published in Nature Sustainability described how suspending solar panels above water canals not only reduces evaporation and mitigates land use, but increases the efficiency of the panels due to the water's cooling effect.[65]
  • Reported 30 March: taking advantage of generally stronger winds further from shore, the world's first floating windfarm, a 30 megawatt facility 15 mi (24 km) off Aberdeenshire, Scotland,[66] broke records for energy output.[67]
  • 31 March: a study published in the PNAS concluded that if food waste is diverted from landfills to avoid methane emissions, food-waste-derived n-paraffin volatile fatty acid-based sustainable aviation fuels could enable up to a 165% reduction in greenhouse gas emissions relative to fossil-derived aviation fuels.[68]
  • 9 April: the World Economic Forum described how companies can use microorganisms to convert CO2 into a protein powder for use in animal feed.[69]
  • 14 May: a study published in Science Advances described a distributed temperature sensing (DTS) system achieving a vertical resolution of ~0.65 m (~25 in.) along a fiber-optic cable, a two-order-of-magnitude improvement over discretely-spaced sensor arrangements.[70] In the Greenland ice sheet, the optical fiber system discovered strong spatial heterogeneity in deformation between and within different ice sections.[70]
  • 8 June: a study published in Environmental Research Letters concluded that artificial ocean alkalinisation (AOA), if carried out with sufficient magnitude and duration, can use current technology to reverse the impact of global ocean acidification on the Great Barrier Reef until atmospheric CO2 concentrations return to today's values—possibly centuries in the future.[71]
  • August reports: in the first customer delivery of its type in history, Swedish company Hybrit said it was delivering "green steel" to truck-maker Volvo AB for prototype vehicles, the steel made using renewable electricity and hydrogen rather than coking coal.[72]
  • 8 September: the largest direct air capture plant, collecting about 4,000 tons of atmospheric CO2} a year to store it underground, began operation in Iceland, selling the most expensive carbon offset in the world for as much as almost $1,400 per ton.[73]
  • 5 October: the Nobel Prize in Physics was awarded "for the physical modeling of Earth's climate, quantifying variability and reliably predicting global warming" to atmospheric physicist Syukuro Manabe (modeled a 40 km (25 mi) high vertical column) and Klaus Hasselmann (developed a model incorporating stochastics (chaotic systems) and identifying human "fingerprints" in climatic effects).[74]

Political, economic, legal, and cultural actions

[edit]
  • From 1 March 2019: the United Nations declared 2021 to be the beginning of the UN Decade on Ecosystem Restoration, having an "aim of supporting and scaling up efforts to prevent, halt and reverse the degradation of ecosystems worldwide and raise awareness of the importance of successful ecosystem restoration".[75]
U.S. President Joe Biden at the Leaders Summit on Climate in April, held virtually because of the COVID-19 pandemic
  • 5 January 2021: a Senate run-off election in the U.S. state of Georgia placed the Democratic party in narrow control of both houses of Congress, as both U.S. Senate Democratic candidates from the state of Georgia, Raphael Warnock and Jon Ossoff win those elections, improving Democratic President Biden's prospects for implementing climate-related policies. Both Raphael Warnock and Jon Ossoff are supporters and advocates the Green New Deal, proposed for the United States.[76]
  • 15 January: France's Total—among Europe's top energy companies that had accelerated plans to cut emissions and build large renewable energy businesses—became the first major global energy company to quit the American Petroleum Institute lobby group, whose largest members resisted investor pressure to diversify to renewables.[77]
  • 20 January: on the afternoon of his inauguration, U.S. President Joe Biden signed a letter re-committing the nation to the 2015 Paris climate accord,[78] reversing Donald Trump's withdrawal that took formal effect on 4 November 2020[79] (the U.S. had been the only country in the world not signatory to the accord.[78]) The White House website was promptly changed to recite that Biden "will take swift action to tackle the climate emergency", reversing Trump's removing mention of greenhouse gas emissions on his first day in office in 2017.[80]
  • 28 January: General Motors said that by 2035 it will end sale of all gasoline and diesel powered passenger cars and light SUVs (excluding medium and heavy duty trucks), and will sell about 30 types of electric vehicles, and planned to halt and review new oil and gas leases on federal lands and waters.[81]
  • January: newly elected U.S. President Joe Biden promised to make the federal government's fleet of 645,000 vehicles 100% all-electric by 2030.[82]
  • Late January: NRG Energy announced that it would be indefinitely shutting down the U.S.'s only remaining facility for carbon capture and storage (CCS), generally presented by the fossil fuel industry as a "clean coal" technology.[83]
  • 1 February: ExxonMobil announced it would invest $3 billion through 2025 (about 3% to 4% of its planned annual capital expenditures) on lower-emission energy technologies, primarily carbon capture and storage projects—distinguished from BP and Royal Dutch Shell who are pursuing renewables.[84]
  • Reported in February: Mexico's populist president Andrés Manuel López Obrador indicated intentions to pursue fossil fuel projects and curtail clean energy, pursuing energy sovereignty with state-run bodies and relegating private clean energy companies to a secondary role.[85]
  • 16 February: billionaire philanthropist Bill Gates published the book, How to Avoid a Climate Disaster.[86]
Burden on future generations

     One generation must not be allowed to consume large portions of the CO2 budget while bearing a relatively minor share of the reduction effort if this would involve leaving subsequent generations with a drastic reduction burden and expose their lives to comprehensive losses of freedom.[Note 5]

  • 17 February: Ford said that by 2026 its European division, with 5% of that region's passenger car market, will offer only electric and plug-in hybrid models, and by 2030 all its passenger cars will run solely on batteries.[88]
  • 2 March: Volvo said that it will convert its entire lineup to battery power by 2030 and will sell them exclusively online—no longer selling cars with internal combustion engines, including hybrids.[89]
  • 25 March: the Supreme Court of Canada ruled constitutional,[Note 6] the Greenhouse Gas Pollution Pricing Act (2018), which required provinces and territories to implement carbon gas pricing systems or adopt one imposed by the federal government.[90]
  • April: JPMorgan Chase set a goal to finance $2.5 trillion over the following 10 years to combat climate change and advance sustainable development, and Citigroup said it would back $1 trillion of similar efforts by 2030.[91] These announcement followed a similar one by Bank of America.[91]
  • 22–23 April: beginning on Earth Day, U. S. President Joe Biden hosted a virtual Leaders Summit on Climate attended by 40 world leaders, aiming to return the U.S. to being a leader in the global effort to reduce greenhouse gas emissions, which CNN called a "stark departure" from the Trump administration.[92]
COP26: The Conference of the Parties...

     21. Recognizes that the impacts of climate change will be much lower at the temperature increase of 1.5 °C compared with 2 °C and resolves to pursue efforts to limit the temperature increase to 1.5 °C;
     22. Recognizes that limiting global warming to 1.5 °C requires rapid, deep and sustained reductions in global greenhouse gas emissions, including reducing global carbon dioxide emissions by 45 per cent by 2030 relative to the 2010 level and to net zero around mid-century, as well as deep reductions in other greenhouse gases;

— Glasgow Climate Pact[93]
13 November 2021
  • 29 April: Germany's Federal Constitutional Court unanimously ruled[Note 5] that the German government must set clear goals for reducing greenhouse gas emissions beyond 2030, stating that existing law placed too much of a burden on future generations to reduce greenhouse gas emissions.[87]
  • 12 May: The U.S. administration granted final approval to the nation's first large-scale offshore wind farm about 15 miles off the coast of Martha's Vineyard, Massachusetts, expected to generate 800 megawatts (enough to power about 400,000 homes), with an ultimate goal to deploy enough offshore wind turbines by 2030 to power 10 million homes.[94] A June 7 article in The New York Times reported that Europe had 5,400 offshore wind turbines, compared to seven (7) in the United States.[95]
  • 28 May: court and shareholder actions succeeded against Shell Oil (Dutch court ordering Shell to cut emissions by 45% within 10 years), Exxon-Mobil (two climate activist hedge fund candidates receiving board positions), and Chevron (shareholders imposing emissions targets).[96]
  • 11–13 June: leaders at the 47th G7 summit reaffirmed their goal to limit global heating to 1.5 °C and promised to cut collective emissions in half by 2030, but did not clearly lay out a plan to raise $100 billion a year for poorer countries to adopt clean energy, and did not agree on a timeline to end use of coal for electric power.[97]
  • 24 June: the European Parliament approved a landmark law to make the EU's greenhouse gas emissions targets legally binding, setting targets to reduce net EU emissions by 55% by 2030 from 1990 levels and eliminate net emissions by 2050.[98]
Conclusion on the Rights of Nature

     The rights of nature protect ecosystems and natural processes for their intrinsic value, thus complementing them with the human right to a healthy and ecologically balanced environment. The rights of nature, like all constitutional rights, are justiciable and, consequently, judges are obliged to guarantee them.

  • 15 July: the government of Greenland decided to cease issuing new licenses for oil and gas exploration "based upon economic calculations, but considerations of the impact on climate and the environment also play a central role in the decision".[100]
  • 18 August: a study published in Nature, considering the effect of ultraviolet radiation on the growth of plants serving as a carbon sink, estimated that the Montreal Protocol's late 1980s prohibition of ozone-depleting chemicals may have prevented an additional 115—235 parts per million of atmospheric CO2, which might have led to a 0.50–1.0 °C increase in global average temperature by 2100.[101]
  • Mid-September: China began enforcing the Kigali Amendment (2016) to the Montreal Protocol, pledging to immediately stop emitting HFC-23, a greenhouse gas 14,600 times more powerful than carbon dioxide.[102]
  • 21 September: China announced it will stop funding overseas coal projects, estimated to affect 54 gigawatts, the cancellation averting about three months worth of global greenhouse gas emissions.[103]
  • 1–12 November: 2021 United Nations Climate Change Conference (COP26), postponed for a year because of the COVID-19 pandemic, takes place in Glasgow, Scotland,[104] resulting in the Glasgow Climate Pact.[93]
  • 10 November: in a case involving mining in a protected region of the Ecuadorian rainforest, the Constitutional Court of Ecuador issued a landmark decision interpreting the country's constitutional provisions to grant rights and confer protections to ecosystems.[99]
  • 8 April 2022: the World Economic Forum reported that for the first time, wind and solar generated more than 10% of electricity globally in 2021, with fifty countries having crossed the 10% threshold.[105] However, power from coal rose 9% to a new record high.[105]

Mitigation goal statements

[edit]
The emissions gap remains large:

      Compared to previous unconditional Nationally Determined Contributions, the new pledges for 2030 reduce projected 2030 emissions by only 7.5 per cent, whereas 30 per cent (reduction) is needed for 2 °C and 55 per cent is needed for 1.5 °C.[106]

  • 27 January: newly elected U.S. President Joe Biden signed executive orders designed to put the country on a path to 100 percent carbon-free electricity by 2035 and net-zero greenhouse gas emissions by 2050.[82]
  • February: IBM pledged to have net-zero emissions by 2030 (cutting emissions by 65% by 2025 compared to 2010 levels), following similar pledges by Microsoft (to be "carbon negative" by 2030) and Amazon (net-zero by 2040).[107]
  • 21 April: co-legislators of the European Climate Law reached a provisional agreement on a key element of the European Green Deal, which the European Commission said "enshrines the EU's commitment to reaching climate neutrality by 2050 and the intermediate target of reducing net greenhouse gas emissions by at least 55% by 2030, compared to 1990 levels".[108]
  • 22 April: At the 2021 Leaders' Climate Summit on Earth Day, U.S. President Joe Biden announced a new target for the US, aiming to reduce greenhouse gas emissions by 50-52% by 2030 relative to 2005 levels.[109][110]

Adaptation goal statements

[edit]
  • May: A Carbon Disclosure Project survey found that in 2020, about 43% of 800 surveyed cities (combined population: 400 million) did not have a climate adaptation plan.[111]

Public opinion and scientific consensus

[edit]
Academic studies of scientific agreement on human-caused global warming among climate experts (2010–2015) reflect that the level of scientific consensus correlates with expertise in climate science.[112] A 2019 study found scientific consensus to be at 100%,[113] and a 2021 study concluded that consensus exceeded 99%.[114] Another 2021 study found that 98.7% of climate experts indicated that the Earth is getting warmer mostly because of human activity.[115]
Causation: Results of a public survey in 31 countries of public opinion, specifically among Facebook users, on the causes of climate change.[116]
Perception of seriousness: Results of a public survey overseen by the United Nations Development Programme on belief in whether climate change presents a climate emergency.[117]
  • In January, the United Nations Development Programme released results of the Peoples Climate Vote (1.2 million respondents in over 50 countries), which found that 64% said that climate change was an emergency.[118]
  • In June, the Yale Program on Climate Change Communication and Facebook Data for Good jointly published International Public Opinion on Climate Change, describing beliefs, attitudes, policy preferences, and behaviors of Facebook users in 31 countries and territories worldwide, including knowledge and beliefs, perceived risks, support for government action, economic concerns, and activism.[116]
  • 19 October: based on a review of 3,000 peer-reviewed publications randomly chosen from a dataset of 88,125 published since 2012, a study published in Environmental Research Letters concluded with high statistical confidence that the scientific consensus on human-caused contemporary climate change exceeds 99% in the peer-reviewed scientific literature.[114]

Projections

[edit]
The IPCC Sixth Assessment Report (2021) projects progressively large increases in both the frequency (horizontal bars) and intensity (vertical bars) of extreme weather events, for various degrees of global warming.[119]
  • 24 January, the World Economic Forum listed top 10 risks by likelihood (extreme weather as #1, climate action failure as #2, human environmental damage as #3) and by severity (climate action failure as #2, human environmental damage as #6, extreme weather as #8).[120]
  • 9 February: a Communications Earth & Environment article concluded that emissions reductions must increase by 80% beyond nationally determined contributions (NDCs) (from 1% to 1.8% per year) to meet the 2 °C target of the 2015 Paris Convention.[121]
  • 19 February: a study published in Geophysical Research Letters studied 1952–2011 data on the timing of seasons[Note 7] and projected that, by 2100, summer in the northern mid-latitudes will last nearly half a year and winter will last less than 2 months.[122]
  • 8 March: a study published in Nature Geoscience concluded that "limiting global warming to 1.5  °C will prevent most of the tropics from reaching a TW[Note 8] of 35  °C (95  °F), the limit of human adaptation".[123]
  • 16 March: the International Renewable Energy Agency's Outlook indicated that energy transition investment would have to increase by 30% over planned investment to a total of US$131 trillion between 2021 and 2050—$4.4 trillion/year—to meet 2050 CO2 reduction targets.[124]
  • 8 April: a study published in Geophysical Research Letters projected that limiting 21st-century warming to 2 °C will halve the Antarctic ice shelf area susceptible to collapsing and disintegrating, compared to the 34% of all Antarctic ice shelf loss projected for 4 °C warming.[125]
  • 9 April: a study published in Science Advances used higher resolution climate models that included modeling of ocean eddies, to project that global mean sea level rise at the end of this century would be about 25% lower than previous models.[126]
  • 20 April: a study accepted for publication in Environmental Research Letters concluded that immediately pursuing all presently available methane emission reduction measures could avoid 0.25 °C additional global mean warming by mid-century, and set a path to avoid more than 0.5 °C warming by 2100.[127]
  • 22 April: Swiss re-insurer Swiss Re forecast that, compared to growth levels without climate change, the world will have 11—14% less economic output (as much as $23 trillion less, annually) by 2050.[128]
  • 30 April: a study published in Science Advances projected that the positive feedback effect of crustal rebound as the West Antarctic Ice Sheet melts,[Note 9] could cause an 18% amplification of the 21st century's global mean sea level (GMSL) rise, and 1 meter additional GMSL rise over the next millennium.[129]
  • 5 May: a study published in Nature projected that limiting global warming to 1.5 °C would reduce the land ice contribution to sea level rise by 2100 from 25 cm to 13 cm (from 10 to 6 in.), with glaciers responsible for half the sea level rise contribution.[130]
  • 5 May: a study published in Nature used an observationally calibrated ice sheet–shelf model to project that with 2 °C global warming, Antarctic ice loss will continue at its current pace; but that current policies would allow 3 °C warming and give an abrupt jump around 2060 to an order of magnitude increase in the rate of sea-level rise (to 0.5 cm/yr) by 2100.[131]
  • 5 May: a study accepted for publication in Environmental Research Letters reported that greenhouse gas emissions have heated the troposphere and cooled the stratosphere so that stratospheric thickness has shrunk over decades, and projected an additional thinning of 1.3 km by 2080 if Earth follows an RCP 6.0 scenario.[132]
If pledges are met

      Global warming at the end of the century is estimated at 2.7 °C if all unconditional 2030 pledges are fully implemented and 2.6 °C if all conditional pledges are also implemented. If the net-zero emissions pledges are additionally fully implemented, this estimate is lowered to around 2.2 °C.[133]

United Nations Emissions Gap Report
26 Oct 2021
  • 5 May: The United Nations Environment Programme's Global Methane Assessment forecast that human-caused methane emissions can be reduced by up to 45 percent this decade and would avoid nearly 0.3 °C of global warming by 2045, and can be consistent with keeping the 1.5˚C goal for the century.[134]
  • May: Bloomberg NEF projected that by 2027, battery-powered electric vehicle prices would reach price parity with internal combustion engine vehicles in all light vehicle segments in Europe.[135]
  • 20 May: a study published in Nature Communications applied palaeoecological evidence (14,000–3600 years ago) to conclude that alpine areas actually developed less plant biodiversity with the upward advance of forest treelines, the researchers' simulation projecting a substantive decrease in plant biodiversity in response to global warming-related treeline rise.[136]
  • 20 May: the Arctic Monitoring and Assessment Programme reported climate models projecting that the probability of an ice-free Arctic summer is 10 times greater under a 2 °C global warming scenario compared with a 1.5 °C scenario.[26]
  • 26 May: an article published in the Proceedings of the National Academy of Sciences projected that under RCP 8.5 ("business as usual" scenario), the temperature experienced by an average human will change more in coming decades than over the past six millennia; the mean human-experienced temperature rise by 2070 will amount to an estimated 7.5 °C—about 2.3 times the mean global temperature rise;[Note 10] and 3.5 billion people will be exposed to mean annual temperature ≥29.0 °C−presently found in 0.8% of the global land surface (mainly the Sahara) but projected to cover 19% of global land in 2070.[137]
  • 29 July: a study published in Nature Communications estimated that adding 4,434 metric tons of CO2—the lifetime emissions of 3.5 average Americans—will cause one excess death globally between 2020 and 2100.[138] The study included only heat-related mortality impacts, and not indirect impacts such as flooding, storms, and crop failures.[138]

Significant publications

[edit]
Climate Change 2021:
The Physical Science Basis

      [A.1] It is unequivocal that human influence has warmed the atmosphere, ocean and land. Widespread and rapid changes in the atmosphere, ocean, cryosphere and biosphere have occurred.
      [A.3] Evidence of observed changes in extremes such as heatwaves, heavy precipitation, droughts, and tropical cyclones, and, in particular, their attribution to human influence, has strengthened since AR5 (2014).
      [B.1] Global surface temperature will continue to increase until at least the mid-century under all emissions scenarios considered. Global warming of 1.5 °C and 2 °C will be exceeded during the 21st century unless deep reductions in CO2 and other greenhouse gas emissions occur in the coming decades.
      [B.3] Continued global warming is projected to further intensify the global water cycle, including its variability, global monsoon precipitation and the severity of wet and dry events.
      [B.5] Many changes due to past and future greenhouse gas emissions are irreversible for centuries to millennia, especially changes in the ocean, ice sheets and global sea level.
      [D.2] Under these contrasting scenarios (low versus high greenhouse gas emissions), discernible differences in trends of global surface temperature would begin to emerge from natural variability within around 20 years, and over longer time periods for many other climatic impact-drivers.

IPCC AR6 WGI "Summary for Policymakers" (9 Aug 2021)[139]
  • WGI AR6 (9 August 2021). "Climate Change 2021 / The Physical Science Basis / Working Group I contribution to the WGI Sixth Assessment Report of the Intergovernmental Panel on Climate Change" (PDF). IPCC.ch. Intergovernmental Panel on Climate Change. Archived (PDF) from the original on 9 August 2021. (Full report: >250MBytes; all 3,949 pages)
Link to Summary for Policymakers (41 pages)

See also

[edit]

Notes

[edit]
  1. ^ The Nature Climate Change article (2021-03-08) stated that "coastal inhabitants are preferentially located in subsiding locations", and advocated "appropriate policy for groundwater utilization and drainage" that would "offer substantial and rapid benefits to reduce growth of coastal flood exposure due to relative sea-level rise".
  2. ^ Outburst floods such as the one in India can result from rockfall causing a glacier to fragment and avalanche, or by collapse of dams of debris left behind by retreating glaciers that had formed lakes of water formed from glacier melt. (See The New York Times article of 8 Feb 2021.)
  3. ^ Shugar et al. 2021 wrote, "Although we cannot attribute this individual disaster specifically to climate change, the possibly increasing frequency of high-mountain slope instabilities can likely be related to observed atmospheric warming and corresponding long-term changes in cryospheric conditions (glaciers, permafrost). Multiple factors beyond those listed above contributed to the Chamoli rock and ice avalanche, including the geologic structure and steep topography, possible long-term thermal disturbances in permafrost bedrock induced by atmospheric warming, stress changes due to the decline and collapse of adjacent and overlying glaciers, and enhanced melt water infiltration during warm periods."
  4. ^ Science Brief defines "tropical cyclones" to include tropical storms, hurricanes, and typhoons.
  5. ^ a b The German high court specifically cited the goals of the Paris Convention as impacting the freedom of future generations: "The constitutional climate goal arising from Article 20a GG is more closely defined in accordance with the Paris target as being to limit the increase in the global average temperature to well below 2 °C and preferably to 1.5 °C above pre-industrial levels. For this target to be reached, the reductions still necessary after 2030 will have to be achieved with ever greater speed and urgency. These future obligations to reduce emissions have an impact on practically every type of freedom because virtually all aspects of human life still involve the emission of greenhouse gases and are thus potentially threatened by drastic restrictions after 2030. * * * (O)ne generation must not be allowed to consume large portions of the CO2 budget while bearing a relatively minor share of the reduction effort if this would involve leaving subsequent generations with a drastic reduction burden and expose their lives to comprehensive losses of freedom."
  6. ^ The Court reasoned that global warming causes harm beyond provincial boundaries and that it is a matter of national concern under the "peace, order and good government" clause of the Constitution. The majority noted the Act would only apply where provincial or territorial pricing systems are not strict enough to reduce global warming.
  7. ^ From Wang et al., Geophysical Research Letters: "We find that lengths and start dates of the four seasons have changed, and the changes will be amplified in the future. Over the period of 1952–2011, the length of summer increased from 78 to 95 days and that of spring, autumn and winter decreased from 124 to 115, 87 to 82, and 76 to 73 days, respectively."
  8. ^ "TW" focuses on wet-bulb temperature, which accounts for both temperature and humidity, and is similar to what is commonly known as heat index.
  9. ^ Pan et al. explain that "this additional contribution to GMSL, as well as the rapid time scale in which it is reached, is a consequence of the unique setting of WAIS: The ice sheet is grounded on bedrock that is largely below local sea level, and it is underlain by an anomalously hot, low-viscosity mantle and thin lithosphere."
  10. ^ Xu et al. explain the discrepancy between human-experienced temperature rise and global average temperature rise "is largely due to the fact that the land will warm much faster than the oceans, but also ... that population growth is projected to be predominantly in hotter places."

References

[edit]
  1. ^ a b (U.N. secretariat 2021, ¶ 13)
  2. ^ "Greater Climate Ambition Urged as Initial NDC Synthesis Report Is Published". UNFCCC.int. United Nations Climate Change. 26 February 2021. Archived from the original on 26 February 2021.
  3. ^ "Warming stripes show that climate change is here and now". WMO.int. World Meteorological Organization. 21 June 2021.
  4. ^ Ripple, William J.; Wolf, Christopher; Newsome, Thomas M.; Baarnard, Phoebe; et al. (5 November 2019). "World Scientists' Warning of a Climate Emergency". BioScience. 70 (1): 8–12. doi:10.1093/biosci/biz088. hdl:2445/151800.
  5. ^ Ripple, William J.; Wolf, Christopher; Newsome, Thomas M.; Gregg, Jillian W.; et al. (28 July 2021). "World Scientists' Warning of a Climate Emergency 2021". BioScience. 71 (9): biab079. doi:10.1093/biosci/biab079. hdl:10871/126814. ISSN 0006-3568.
  6. ^ Atwoli, L.; Baqui, A. H.; Benfield, T.; Bosurgi, R.; Godlee, F.; Hancocks, S.; Horton, R.; Laybourn-Langton, L.; Monteiro, C. A.; Norman, I.; Patrick, K.; Praities, N.; Olde Rikkert MGM; Rubin, E. J.; Sahni, P.; Smith, R.; Talley, N. J.; Turale, S.; Vázquez, D. (6 September 2021). Atwoli, Lukoye; Baqui, Avdullah H.; Benfield, Thomas; Bosurgi, Raffaelle; Godlee, Fiona; Hancocks, Stephen; Horton, Richart (eds.). "Call for emergency action to limit global temperature increases, restore biodiversity, and protect health". BMJ. 374: n1734. doi:10.1136/bmj.n1734. PMC 8414196. PMID 34483099. S2CID 237418050.
  7. ^ "Climate action: 'Time is running out', UN chief tells ministers". UN.org. United Nations. 30 September 2021. Archived from the original on 2 October 2021.
  8. ^ "Global Climate Change / Vital Signs of the Planet". climate.NASA.gov. NASA. 31 December 2021. Archived from the original on 31 December 2021.
  9. ^ a b Slater, Thomas; Lawrence, Isobel R.; Otosaka, Inès; Shepherd, Andrew; et al. (25 January 2021). "Review article: Earth's ice imbalance". The Cryosphere. 15 (1): 233–246. Bibcode:2021TCry...15..233S. doi:10.5194/tc-15-233-2021. hdl:20.500.11820/df343a4d-6b66-4eae-ac3f-f5a35bdeef04. S2CID 234098716.
  10. ^ Vohra, Karn; Vodonos, Alina; Schwartz, Joel; Marais, Eloise A.; et al. (9 February 2021). "Global mortality from outdoor fine particle pollution generated by fossil fuel combustion: Results from GEOS-Chem". Environmental Research. 2021 (110754): 110754. Bibcode:2021EnvRe.19510754V. doi:10.1016/j.envres.2021.110754. ISSN 0013-9351. PMID 33577774. S2CID 231909881.
  11. ^ Anderegg, William R. L.; Abatzoglou, John T.; Andeeregg, Leander D. L.; Bielory, Leonard; et al. (16 February 2021). "Anthropogenic climate change is worsening North American pollen seasons". Proceedings of the National Academy of Sciences. 118 (7): e2013284118. Bibcode:2021PNAS..11813284A. doi:10.1073/pnas.2013284118. PMC 7896283. PMID 33558232.
  12. ^ a b Caesar, L.; McCarthy, G. D.; Thornalley, D. J. R.; Cahill, N.; Rahmstorf, S. (25 February 2021). "Current Atlantic Meridional Overturning Circulation weakest in last millennium". Nature Geoscience. 14 (3): 118–120. Bibcode:2021NatGe..14..118C. doi:10.1038/s41561-021-00699-z. S2CID 232052381.
  13. ^ Mooney, Chris; Freedman, Andrew (25 February 2021). "Scientists see stronger evidence of slowing Atlantic Ocean circulation, an 'Achilles' heel' of the climate". The Washington Post. Archived from the original on 25 February 2021.
  14. ^ Boers, Niklas (5 August 2021). "Observation-based early-warning signals for a collapse of the Atlantic Meridional Overturning Circulation". Nature Climate Change. 11 (8): 680–688. Bibcode:2021NatCC..11..680B. doi:10.1038/s41558-021-01097-4. S2CID 236930519.
  15. ^ Betts, Richard (16 March 2021). "Met Office: Atmospheric CO2 now hitting 50% higher than pre-industrial levels". Carbon Brief. Archived from the original on 16 March 2021.
  16. ^ Micholls, Robert J.; Lincke, Daniel; Hinkel, Jochen; Brown, Sally; et al. (8 March 2021). "A global analysis of subsidence, relative sea-level change and coastal flood exposure" (PDF). Nat. Clim. Change. 11 (4): 338–342. Bibcode:2021NatCC..11..338N. doi:10.1038/s41558-021-00993-z. S2CID 232145685.
  17. ^ "Responding to Disasters and Displacement in a Changing Climate: Case Studies" (PDF). ifrc.org. International Federation of Red Cross and Red Crescent Societies. 17 March 2021. Archived (PDF) from the original on 17 March 2021.
  18. ^ Sala, Enric; Mayorga, Juan; Bradley, Darcy; Cabral, Reniel B.; et al. (17 March 2021). "Protecting the global ocean for biodiversity, food and climate". Nature. 592 (7854): 397–402. Bibcode:2021Natur.592..397S. doi:10.1038/s41586-021-03371-z. PMID 33731930. S2CID 232301777.
  19. ^ Brás, Teresa Armada; Seixas, Júlia; Carvalhais, Nuno; Jägermeyr, Jonas (March 2021). "Severity of drought and heatwave crop losses tripled over the last five decades in Europe". Environmental Research Letters. 16 (6). IOP Publishing: 065012. Bibcode:2021ERL....16f5012B. doi:10.1088/1748-9326/abf004. hdl:10362/144590. S2CID 233655172. (accepted manuscript 18 March 2021)
  20. ^ Ortiz-Bobea, Ariel; Ault, Toby R.; Carrillo, Carlos M.; Chambers, Robert G.; Lobell, David B. (1 April 2021). "Anthropogenic climate change has slowed global agricultural productivity growth". Nat. Clim. Change. 11: 306–312. doi:10.6077/pfsd-0v93.
  21. ^ "Despite pandemic shutdowns, carbon dioxide and methane surged in 2020". NOAA.gov. National Oceanic and Atmospheric Administration. 7 April 2021. Archived from the original on 7 April 2021.
  22. ^ "'Average' Atlantic hurricane season to reflect more storms". NOAA.gov. National Oceanic and Atmospheric Administration. 9 April 2021. Archived from the original on 9 April 2021.
  23. ^ "NOAA's Updated U.S. Climate Data Will Establish "New Normal"". NCEI.NOAA.gov. National Centers for Environmental Information (part of NOAA). 10 February 2021. Archived from the original on 22 March 2021.
  24. ^ Hugonnet, Romain; McNabb, Robert; Berthier, Etienne; Menounos, Brian; et al. (28 April 2021). "Accelerated global glacier mass loss in the early twenty-first century". Nature. 592 (7856): 726–731. Bibcode:2021Natur.592..726H. doi:10.1038/s41586-021-03436-z. hdl:10852/91528. PMID 33911269. S2CID 233446479.
  25. ^ Winkler, Karina; Fuchs, Richard; Rounsevell, Mark; Herold, Martin (11 May 2021). "Global land use changes are four times greater than previously estimated". Nature Communications. 12 (1): 2501. Bibcode:2021NatCo..12.2501W. doi:10.1038/s41467-021-22702-2. PMC 8113269. PMID 33976120.
  26. ^ a b (AMAP Secretariat 2021)
  27. ^ Zeng, Xubin; Eyre, J. E. Jack Reeves; Dixon, Ross D.; Arevalo, Jorge (21 May 2021). "Quantifying the Occurrence of Record Hot Years Through Normalized Warming Trends". Geophysical Research Letters. 48 (10): e2020GL091626. Bibcode:2021GeoRL..4891626Z. doi:10.1029/2020GL091626. OSTI 1798413. S2CID 236399809. Explained by: Kelley, Mikayla MacE (3 June 2021). "Record-breaking temperatures more likely in populated tropics". Phys.org. Archived from the original on 3 June 2021.
  28. ^ Hawkings, Jon R.; Linhoff, Benjamin S.; Wadham, Jemma L.; Stibal, Marek; et al. (24 May 2021). "Large subglacial source of mercury from the southwestern margin of the Greenland Ice Sheet". Nature Geoscience. 14 (7): 496–502. Bibcode:2021NatGe..14..496H. doi:10.1038/s41561-021-00753-w. hdl:10037/21534. S2CID 235173540.
  29. ^ Vicedo-Cabrera, A. M.; Scovronick, N.; Sera, F.; Royé, D.; Schneider, R.; Tobias, A.; Astrom, C.; Guo, Y.; Honda, Y.; Hondula, D.M. (31 May 2021). "The burden of heat-related mortality attributable to recent human-induced climate change". Nature Climate Change. 11 (6): 492–500. Bibcode:2021NatCC..11..492V. doi:10.1038/s41558-021-01058-x. PMC 7611104. PMID 34221128. S2CID 235259968.
  30. ^ Qiu, Chunjing; Ciais, Philippe; Zhu, Dan; Guenet, Bertrand; et al. (4 June 2021). "Large historical carbon emissions from cultivated northern peatlands". Science Advances. 7 (23): eabf1332. doi:10.1126/sciadv.abf1332. PMC 8177697. PMID 34088663. Explained by: Mooney, Chris (4 June 2021). "An enormous missing contribution to global warming may have been right under our feet". The Washington Post. Archived from the original on 6 June 2021.
  31. ^ Loeb, Norman G.; Johnson, Gregory C.; Thorsen, Tyler J.; Lyman, John M.; Rose, Fred G.; Kato, Seiji (15 June 2021). "Satellite and Ocean Data Reveal Marked Increase in Earth's Heating Rate". Geophysical Research Letters. 48 (13). Bibcode:2021GeoRL..4893047L. doi:10.1029/2021GL093047. S2CID 236233508.
  32. ^ Raghuraman, Shiv Priyam; Paynter, David; Ramaswamy, V. (28 July 2021). "Anthropogenic forcing and response yield observed positive trend in Earth's energy imbalance". Nature Communications. 12 (1): 4567. Bibcode:2021NatCo..12.4577R. doi:10.1038/s41467-021-24544-4. PMC 8319337. PMID 34321469.
  33. ^ a b c Jones, Dave (30 March 2022). "Global Electricity Review 2022". Ember-climate.org. Ember (non-profit organisation). Archived from the original on 2 April 2022.
  34. ^ "Global Electricity Review 2022" (PDF). Ember. March 2022. p. 27. Archived (PDF) from the original on 30 March 2022. "Countries with populations less than 3 million in 2021 were not included in this ranking."
  35. ^ "Weather-related disasters increase over past 50 years, causing more damage but fewer deaths". WMO.int. World Meteorological Organization. 31 August 2021. Archived from the original on 14 December 2023. (Link to Atlas of Mortality and Economic Losses... (90 pp))
  36. ^ Feng, Xiao; Merow, Cory; Liu, Zhihua; Park, Daniel S.; et al. (1 September 2021). "How deregulation, drought and increasing fire impact Amazonian biodiversity". Nature. 597 (7877): 516–521. Bibcode:2021Natur.597..516F. doi:10.1038/s41586-021-03876-7. PMID 34471291. S2CID 237388791.
  37. ^ Tuholske, Cascade; Caylor, Kelly; Funk, Chris; Verdin, Andrew; et al. (12 October 2021). "Global urban population exposure to extreme heat". Proceedings of the National Academy of Sciences of the United States of America. 118 (41): e2024792118. Bibcode:2021PNAS..11824792T. doi:10.1073/pnas.2024792118. PMC 8521713. PMID 34607944.
  38. ^ Souter, David; Planes, Serge; Widquart, Jérémy; Logan, Murray; Obura, David; Staub, Francis, eds. (October 2021). Status of Coral Reefs of the World: 2020 / Executive Summary (PDF). Global Coral Reef Monitoring Network. p. 16. Archived (PDF) from the original on 5 October 2021.
  39. ^ a b "Increase in atmospheric methane set another record during 2021 / Carbon dioxide levels also record a big jump". NOAA.gov. 7 April 2022. Archived from the original on 7 April 2022.
  40. ^ Fountain, Henry (8 February 2021). "Mountains, Ice and Climate Change: A Recipe for Disasters / Shrinking and thinning of glaciers is one of the most documented signs of global warming caused by rising levels of greenhouse gases". The New York Times. Archived from the original on 8 February 2021.
  41. ^ Shugar, D. H.; Jacquemart, M.; Shean, D.; Bhushan, S.; et al. (10 June 2021). "A massive rock and ice avalanche caused the 2021 disaster at Chamoli, Indian Himalaya". Science. 373 (6552): 300–306. Bibcode:2021Sci...373..300S. doi:10.1126/science.abh4455. PMID 34112725. S2CID 235402626.
  42. ^ a b c Knutson, Thomas R.; Chung, Maya V.; Vecchi, Gabriel; Sun, Jingru; et al. (March 2021). "Climate change is probably increasing the intensity of tropical cyclones / ScienceBrief Review" (PDF). ScienceBrief.org. Science Brief. Archived (PDF) from the original on 27 March 2021.
  43. ^ Nuccitelli, Dana (14 December 2021). "2021 was a remarkable year for Earth's climate". YaleClimateConnection.org. Archived from the original on 31 December 2021.
  44. ^ Mann, Michael E.; Steinman, Byron A.; Bouillette, Daniel J.; Miller, Sonya K. (5 March 2021). "Multidecadal climate oscillations during the past millennium driven by volcanic forcing". Science. 5 (371): 1014–1019. Bibcode:2021Sci...371.1014M. doi:10.1126/science.abc5810. PMID 33674487. S2CID 232124643.
  45. ^ Covey, Kristofer; Soper, Fiona; Pangala, Sunitha; Bernardino, Angelo; et al. (11 March 2021). "Carbon and Beyond: The Biogeochemistry of Climate in a Rapidly Changing Amazon". Front. For. Glob. Change. 4. doi:10.3389/ffgc.2021.618401. ISSN 2624-893X. S2CID 232172375.
  46. ^ Deng, S.; Liu, S.; Mo, X.; Jiang, L.; Bauer-Gottwein, P. (22 March 2021). "Polar Drift in the 1990s Explained by Terrestrial Water Storage Changes". Geophysical Research Letters. 48 (7): e2020GL092114. Bibcode:2021GeoRL..4892114D. doi:10.1029/2020GL092114. S2CID 233703565.
  47. ^ Cassella, Carly (30 March 2021). "The Earliest Cherry Blossom Season in 1,200 Years Is Here Due to Climate Change". ScienceAlert.com. Archived from the original on 30 March 2021.
  48. ^ Jeffrey, Luke C.; Maher, Damien T.; Chiri, Eleonora; Leung, Pok Man; et al. (9 April 2021). "Bark-dwelling methanotrophic bacteria decrease methane emissions from trees". Nature Communications. 12 (2127): 2127. Bibcode:2021NatCo..12.2127J. doi:10.1038/s41467-021-22333-7. PMC 8035153. PMID 33837213. S2CID 233201655.
  49. ^ van Heerwaarden, Belinda; Sgrò, Carla (13 April 2021). "Male fertility thermal limits predict vulnerability to climate warming". Nature Communications. 12 (2214): 2214. Bibcode:2021NatCo..12.2214V. doi:10.1038/s41467-021-22546-w. PMC 8044094. PMID 33850157.
  50. ^ Mack, Michelle C.; Walker, Xanthe J.; Johnstone, Jill F.; Alexander, Heather D.; Melvin, April M.; Jean, Mélanie; Miller, Samantha N. (16 April 2021). "Carbon loss from boreal forest wildfires offset by increased dominance of deciduous trees". Science. 372 (6539). American Association for the Advancement of Science: 280–283. Bibcode:2021Sci...372..280M. doi:10.1126/science.abf3903. PMID 33859032. S2CID 233245004.
  51. ^ Cappucci, Matthew (19 April 2021). "Typhoon Surigae intensified with surprising speed, bearing the fingerprint of climate change". The Washington Post. Archived from the original on 19 April 2021.
  52. ^ Lang, Stephen (26 January 2022). "NASA's GPM satellite tracks Typhoon Surigae in the West Pacific". Goddard Spaceflight Center of the National Aeronautics and Space Administration. Archived from the original on 28 March 2023.
  53. ^ Higuera, Philip E.; Shuman, Bryan N.; Wolf, Kyra D. (14 June 2021). "Rocky Mountain subalpine forests now burning more than any time in recent millennia". Proceedings of the National Academy of Sciences. 118 (25): e2103135118. Bibcode:2021PNAS..11803135H. doi:10.1073/pnas.2103135118. PMC 8237630. PMID 34161283.
  54. ^ Almar, Rafael; Ranasinghe, Roshanka; Bergsma, Erwin W. J.; Diaz, Harold; et al. (18 June 2021). "A global analysis of extreme coastal water levels with implications for potential coastal overtopping". Nature Communications. 12 (1): 3775. Bibcode:2021NatCo..12.3775A. doi:10.1038/s41467-021-24008-9. PMC 8213734. PMID 34145274.
  55. ^ "Western North American extreme heat virtually impossible without human-caused climate change". WorldWeatherAttribution.org (Press release). World Weather Attribution. 7 July 2021. Archived from the original on 8 July 2021. Full study.
  56. ^ Gatti, Luciana V.; Basso, Luana S.; Miller, John B.; Gloor, Manuel; et al. (14 July 2021). "Amazonia as a carbon source linked to deforestation and climate change". Nature. 595 (7867): 388–393. Bibcode:2021Natur.595..388G. doi:10.1038/s41586-021-03629-6. PMID 34262208. S2CID 235906356.
  57. ^ Froitzheim, Nikolaus; Majka, Jaroslaw; Zastrozhnov, Dmitry (10 August 2021). "Methane release from carbonate rock formations in the Siberian permafrost area during and after the 2020 heat wave". Proceedings of the National Academy of Sciences. 118 (32): e2107632118. Bibcode:2021PNAS..11807632F. doi:10.1073/pnas.2107632118. PMC 8364203. PMID 34341110.
  58. ^ "Rain on Greenland ice sheet signals climate change risk". Phys.org. 23 August 2021. Archived from the original on 25 August 2021.
  59. ^ a b Zheng, Bo; Ciais, Philippe; Chevallier, Frederic; Yang, Hui; et al. (2 March 2023). "Record-high CO2 emissions from boreal fires in 2021". Science. 379 (6635): 912–917. doi:10.1126/science.ade0805. hdl:1871.1/fb09cfab-b06b-4407-ba0e-82c032818c44. PMID 36862792. S2CID 257283260.
  60. ^ a b Chappell, Bill (8 February 2021). "Elon Musk Funds $100 Million XPrize For Pursuit Of New Carbon Removal Ideas". NPR. Archived from the original on 24 February 2021.
  61. ^ Gallagher, Stuart (24 February 2021). "Will synthetic fuel save the performance car? / The manufacturers weigh in Porsche claims a car running on eFuel will have the same CO2 footprint as an EV, and BMW, Audi, Aston Martin and McLaren all agree". Evo.
  62. ^ Kaplan, Sarah; Steckelberg, Aaron (25 February 2021). "It looks like the Batmobile, works on solar energy, and could be the future of cars". The Washington Post. Archived from the original on 26 February 2021.
  63. ^ Aratani, Lauren (27 February 2021). "Electricity needed to mine bitcoin is more than used by 'entire countries'". The Guardian. Archived from the original on 28 February 2021.
  64. ^ Ambrose, Jillian (16 March 2021). "Good vibrations: bladeless turbines could bring wind power to your home". The Guardian. Archived from the original on 16 March 2021.
  65. ^ McKuin, Brandi; Zumkehr, Andrew; Ta, Jenny; Bales, Roger; et al. (18 March 2021). "Energy and water co-benefits from covering canals with solar panels". Nature Sustainability. 4 (7): 609–617. doi:10.1038/s41893-021-00693-8. S2CID 232273487.
  66. ^ Rosa-Aquino, Paola (29 August 2021). "Floating wind turbines could open up vast ocean tracts for renewable power". The Guardian. Archived from the original on 29 August 2021.
  67. ^ Brown, Paul (30 March 2021). "Roaring success of Scottish windfarm shows global potential". The Guardian. Archived from the original on 26 August 2021.
  68. ^ Huq, Nabila A.; Hafenstine, Glenn R.; Huo, Xiangchen; Nguyen, Hannah; Tifft, Stephen M. (30 March 2021). "Toward net-zero sustainable aviation fuel with wet waste–derived volatile fatty acids". Proceedings of the National Academy of Sciences. 118 (13): e2023008118. Bibcode:2021PNAS..11823008H. doi:10.1073/pnas.2023008118. PMC 8020759. PMID 33723013.
  69. ^ McCord, Mark (9 April 2021). "This is how CO2 can be transformed into food for animals". WEForum.org. World Economic Forum. Archived from the original on 9 April 2021.
  70. ^ a b Law, Robert; Christoffersen, Poul; Hubbard, Bryn; Doyle, Samuel H.; et al. (14 May 2021). "Thermodynamics of a fast-moving Greenlandic outlet glacier revealed by fiber-optic distributed temperature sensing". Science Advances. 7 (20). American Association for the Advancement of Science: eabe7136. doi:10.1126/sciadv.abe7136. PMC 8121432. PMID 33990322.
  71. ^ Mongin, Mathieu; Baird, Mark E.; Lenton, Andrew; Neill, Craig; Aki, John (8 June 2021). "Reversing ocean acidification along the Great Barrier Reef using alkalinity injection". Environmental Research Letters. 16 (6): 064068. Bibcode:2021ERL....16f4068M. doi:10.1088/1748-9326/ac002d. S2CID 235376266.
  72. ^ "Green steel: Swedish company ships first batch made without using coal". The Guardian. 18 August 2021. Archived from the original on 19 August 2021.
  73. ^ Hook, Leslie (9 September 2021). "Biggest "Direct Air Capture" Plant Starts Pulling in Carbon, But Involves a Fraction of the Gas in the Atmosphere". InsideClimateNews.org. Archived from the original on 9 September 2021.
  74. ^ "They found hidden patterns in the climate and in other complex phenomena". NobelPrize.org. 5 October 2021. Archived from the original on 5 October 2021.
  75. ^ "Resolution adopted by the General Assembly on 1 March 2019 -- United Nations Decade on Ecosystem Restoration (2021–2030)". UNdocs.org. United Nations. 1 March 2019. Archived from the original on 2 May 2020.
  76. ^ Eilperin, Juliet; Dennis, Brady; Mufson, Steven (7 January 2021). "How the Georgia election results just raised Biden's climate ambitions". The Washington Post. Archived from the original on 12 January 2021.
  77. ^ Bousso, Don (15 January 2021). "France's Total quits top U.S. oil lobby in climate split". Financial Post. Reuters. Archived from the original on 16 January 2021.
  78. ^ a b Beitsch, Rebecca (20 January 2021). "Biden recommits US to Paris climate accord". The Hill. Archived from the original on 20 January 2021.
  79. ^ Arvin, Jariel (6 November 2020). "Europe's leaders on climate change are the first to congratulate President-elect Joe Biden". Vox. Archived from the original on 29 November 2020.
  80. ^ Marcus, Josh (21 January 2021). "White House website mentions climate change again, reversing Trump's info blackout". The Independent. Archived from the original on 3 February 2021.
  81. ^ Mufson, Steven (28 January 2021). "General Motors to eliminate gasoline and diesel light-duty cars and SUVs by 2035". The Washington Post. Archived from the original on 28 January 2021.
  82. ^ a b Bokat-Lindell, Spencer (28 January 2021). "Can Biden Deliver on His Climate Promises?". The New York Times. Archived from the original on 28 January 2021. 'Executive actions are far more ephemeral and easily discarded than legislation, which can set up a whipsaw effect,' The Times editorial board writes. As much as Mr. Biden does to reverse Mr. Trump's reversals, his successor could reverse them again.
  83. ^ Taft, Molly (2 February 2021). "The Only Carbon Capture Plant in the U.S. Just Closed". Gizmodo. Archived from the original on 3 February 2021.
  84. ^ Matthews, Christopher M. (1 February 2021). "Exxon to Create 'Low Carbon' Business Unit as It Faces Activists". The Wall Street Journal. Archived from the original on 9 February 2021.
  85. ^ Agren, David (15 February 2021). "Mexico was once a climate leader – now it's betting big on coal". The Guardian. Archived from the original on 15 February 2021.
  86. ^ Brown, Gordon (17 February 2021). "How to Avoid a Climate Disaster by Bill Gates review – why science isn't enough / The co-founder of Microsoft looks to science and tech to end climate crisis ... but can nations cooperate?". The Guardian. Archived from the original on 17 February 2021.
  87. ^ a b Jordans, Frank (29 April 2021). "Court: Germany must share climate burden between young, old". Associated Press. Archived from the original on 29 April 2021. ● "Verfassungsbeschwerden gegen das Klimaschutzgesetz teilweise erfolgreich (Constitutional complaints against the Climate Protection Act partially successful)". bundesverfassungsgericht.de (in German). Bundesverfassungsgerichts (Federal Constitutional Court). 29 April 2021. Archived from the original on 3 May 2021.
  88. ^ Boudette, Neal E.; Ewing, Jack (17 February 2021). "Ford says it will phase out gasoline-powered vehicles in Europe". The New York Times. Archived from the original on 17 February 2021.
  89. ^ Ewing, Jack (2 March 2021). "Volvo Plans to Sell Only Electric Cars by 2030". The New York Times. Archived from the original on 2 March 2021.
  90. ^ "Case in Brief / Reference re Greenhouse Gas Pollution Pricing Act". scc-csc.ca. Supreme Court of Canada. 25 March 2021. Archived from the original on 25 March 2021.
  91. ^ a b Levitt, Hannah; Surane, Jennifer (15 April 2021). "JPMorgan, Citi Pledge Trillions Toward Climate, Sustainability". Bloomberg.
  92. ^ Sullivan, Kate; Liptak, Kevin (22 April 2021). "Biden announces US will aim to cut carbon emissions by as much as 52% by 2030 at virtual climate summit". CNN. Archived from the original on 23 April 2021. Story was updated on 23 April.
  93. ^ a b (Washington Post Staff 2021)
  94. ^ Friedman, Lisa (12 May 2021). "A breakthrough for U.S. wind power". The New York Times. Archived from the original on 12 May 2021.
  95. ^ Penn, Ivan (7 June 2021). "Offshore Wind Farms Show What Biden's Climate Plan Is Up Against". The New York Times. Archived from the original on 7 June 2021.
  96. ^ Ambrose, Jillian (29 May 2021). "'Black Wednesday' for big oil as courtrooms and boardrooms turn on industry". The Guardian. Archived from the original on 2 June 2021.
  97. ^ "G7 reaffirmed goals but failed to provide funds needed to reach them, experts say". Carbon Brief. 14 June 2021. Archived from the original on 22 June 2021.
  98. ^ Abnett, Kate (24 June 2021). "Climate 'law of laws' gets European Parliament's green light". Reuters. Archived from the original on 27 June 2021.
  99. ^ a b "CASO No. 1149-19-JP/20". CorteConstitucional.gob.ec. Constitutional Court of Ecuador. 10 November 2021. pp. VI. Conclusiones. Archived from the original on 2 December 2021.
    · Discussed by Surma, Katie (3 December 2021). "Ecuador's High Court Affirms Constitutional Protections for the Rights of Nature in a Landmark Decision". Inside Climate News. Archived from the original on 3 December 2021.
  100. ^ "Greenland halts new oil exploration". naalakkersuisut.gl. Government of Greenland. 15 July 2021. Archived from the original on 15 July 2021.
  101. ^ Young, Paul J.; Harper, Anna B.; Huntingford, Chris; Paul, Nigel D.; et al. (18 August 2021). "The Montreal Protocol protects the terrestrial carbon sink". Nature. 596 (7872): 384–388. Bibcode:2021Natur.596..384Y. doi:10.1038/s41586-021-03737-3. PMID 34408332. S2CID 237215751.
  102. ^ McKenna, Phil; Pike, Lily (22 September 2021). "China Just Entered a Major International Climate Agreement. Now Comes the Hard Part". Inside Climate News. Archived from the original on 23 September 2021.
  103. ^ Watts, Jonathan (22 September 2021). "China pledge to stop funding coal projects 'buys time for emissions target'". The Guardian. Archived from the original on 24 September 2021.
  104. ^ "Uniting the World to Tackle Climate Change". ukCOP26.org. U.N. Climate Change Conference 2021. Archived from the original on 3 January 2021.
  105. ^ a b Masterson, Victoria (8 April 2022). "Wind and solar generated 10% of global electricity in 2021 - a world first". World Economic Forum. Archived from the original on 8 April 2022.
  106. ^ (UNEP, UNEP DTU Partnership 2021, ¶ 6 of Executive Summary)
  107. ^ Geman, Ben (16 February 2021). "IBM pledges net-zero emissions by 2030". Axios. Archived from the original on 16 February 2021.
  108. ^ "Commission welcomes provisional agreement on the European Climate Law". European Commission. 21 April 2021. Archived from the original on 21 April 2021.
  109. ^ "Factsheet". The White House. 22 April 2021. Archived from the original on 10 September 2021.
  110. ^ Volcovici, Valerie; Mason, Jeff (22 April 2021). "U.S., other countries deepen climate goals at Earth Day summit". Reuters. Archived from the original on 21 August 2021.
  111. ^ Harvey, Fiona (12 May 2021). "One in four cities cannot afford climate crisis protection measures – study". The Guardian. Archived from the original on 12 May 2021.
  112. ^ Cook, John; Oreskes, Naomi; Doran, Peter T.; Anderegg, William R. L.; et al. (2016). "Consensus on consensus: a synthesis of consensus estimates on human-caused global warming". Environmental Research Letters. 11 (4): 048002. Bibcode:2016ERL....11d8002C. doi:10.1088/1748-9326/11/4/048002. hdl:1983/34949783-dac1-4ce7-ad95-5dc0798930a6.
  113. ^ Powell, James (20 November 2019). "Scientists Reach 100% Consensus on Anthropogenic Global Warming". Bulletin of Science, Technology & Society. 37 (4): 183–184. doi:10.1177/0270467619886266. S2CID 213454806. Archived from the original on 7 December 2020. Retrieved 15 November 2020.
  114. ^ a b Lynas, Mark; Houlton, Benjamin Z.; Perry, Simon (19 October 2021). "Greater than 99% consensus on human caused climate change in the peer-reviewed scientific literature". Environmental Research Letters. 16 (11): 114005. Bibcode:2021ERL....16k4005L. doi:10.1088/1748-9326/ac2966. S2CID 239032360.
  115. ^ Myers, Krista F.; Doran, Peter T.; Cook, John; Kotcher, John E.; Myers, Teresa A. (20 October 2021). "Consensus revisited: quantifying scientific agreement on climate change and climate expertise among Earth scientists 10 years later". Environmental Research Letters. 16 (10): 104030. Bibcode:2021ERL....16j4030M. doi:10.1088/1748-9326/ac2774. S2CID 239047650.
  116. ^ a b Leiserowitz, A.; Carman, J.; Buttermore, N.; Wang, X.; Rosenthal, S.; Marlon, J.; Mulcahy, K. (June 2021). International Public Opinion on Climate Change (PDF). New Haven, CT, U.S.: Yale Program on Climate Change Communication and Facebook Data for Good. Archived (PDF) from the original on 28 June 2021.
  117. ^ ● Survey results from: "The Peoples' Climate Vote". UNDP.org. United Nations Development Programme. 26 January 2021. Archived from the original on 28 January 2021. Fig. 3.
    ● Data re top emitters from: "Historical GHG Emissions / Global Historical Emissions". ClimateWatchData.org. Climate Watch. 2021. Archived from the original on 21 May 2021.
  118. ^ "The Peoples' Climate Vote". UNDP.org. United Nations Development Programme. 26 January 2021. Archived from the original on 28 January 2021. 64% of people said that climate change was an emergency – presenting a clear and convincing call for decision-makers to step up on ambition.
    - The highest level of support was in SIDS (Small Island Developing States, 74%), followed by high-income countries (72%), middle-income countries (62%), then LDCs (Least Developed Countries, 58%).
    - Regionally, the proportion of people who said climate change is a global emergency had a high level of support everywhere - in Western Europe and North America (72%), Eastern Europe and Central Asia (65%), Arab States (64%), Latin America and Caribbean (63%), Asia and Pacific (63%), and Sub-Saharan Africa (61%).
    - Four climate policies emerged as the most popular globally:
    1. Conservation of forests and land (54% public support);
    2. Solar, wind and renewable power (53%);
    3. Climate-friendly farming techniques (52%); and
    4. Investing more in green businesses and jobs (50%).
    (Page has download link to 68-page PDF.)
  119. ^ (WGI AR6 2021, Fig. SPM.6)
  120. ^ Fleming 2021.
  121. ^ Liu, Peiran R.; Raftery, Adrian E. (9 February 2021). "Country-based rate of emissions reductions should increase by 80% beyond nationally determined contributions to meet the 2 °C target". Commun Earth Environ. 2 (29). Nature: 29. Bibcode:2021ComEE...2...29L. doi:10.1038/s43247-021-00097-8. PMC 8064561. PMID 33899003. "We find that on current trends, but without additional efforts to meet the NDCs, the median forecast of global mean temperature increase is 2.8 °C, with likely range (90% prediction interval) [2.1, 3.9] °C. If all countries meet their NDCs, but revert to current trends thereafter, the median forecast declines by 0.2 °C to 2.6 °C, with likely range [2.0, 3.4] °C. If all countries meet their NDCs and continue to reduce carbon emissions at the same rate thereafter, the median forecast declines by a further 0.3 °C, to 2.3 °C, with likely range [1.8, 2.9] °C. The probability of staying below 2 °C is 5% under the “None” scenario, 12% under the “Adjusted” scenario, and 26% under the “Continued” scenario."
  122. ^ Wang, Jiamin; Guan, Yuping; Wu, Lixin; Guan, Xiaodan; et al. (19 February 2021). "Changing Lengths of the Four Seasons by Global Warming". Geophysical Research Letters. 48 (6): e2020GL091753. Bibcode:2021GeoRL..4891753W. doi:10.1029/2020GL091753. The definitions of seasons are provided in "§ 2.2 Definition of the Four Seasons".
  123. ^ Zhang, Yi; Held, Isaac; Fueglistaler, Stephan (8 March 2021). "Projections of tropical heat stress constrained by atmospheric dynamics". Nature Geoscience. 14 (3): 133–137. Bibcode:2021NatGe..14..133Z. doi:10.1038/s41561-021-00695-3. S2CID 232146008.
    ● Norton, Amy (8 March 2021). "Global warming could make survival in tropics impossible: Study". Phys.org. Archived from the original on 10 March 2021.
  124. ^ "World Energy Transitions Outlook: 1.5 °C Pathway (Preview)". irena.org. International Renewable Energy Agency. 16 March 2021. Archived from the original on 16 March 2021. ISBN 978-92-9260-334-2
  125. ^ Gilbert, E.; Kittel, C. (8 April 2021). "Surface melt and runoff on Antarctic ice shelves at 1.5 °C, 2 °C and 4 °C of future warming". Geophysical Research Letters. 48 (8): e91733. Bibcode:2021GeoRL..4891733G. doi:10.1029/2020GL091733. S2CID 234886251.
  126. ^ van Westen, René M.; Dijkstra, Henk A. (9 April 2021). "Ocean eddies strongly affect global mean sea-level projections". Science Advances. 7 (15): eabf1674. Bibcode:2021SciA....7.1674V. doi:10.1126/sciadv.abf1674. PMC 8034847. PMID 33837083. S2CID 233194458.
  127. ^ Ocko, Ilissa Bonnie; Sun, Tianyi; Shindell, Drew; Oppenheimer, Michael; et al. (20 April 2021). "Acting rapidly to deploy readily available methane mitigation measures by sector can immediately slow global warming". Environmental Research Letters. 16 (5). IOP Publishing Ltd: 054042. Bibcode:2021ERL....16e4042O. doi:10.1088/1748-9326/abf9c8. S2CID 234859914. Accepted Manuscript is the version of the article accepted for publication including all changes made as a result of the peer review process
  128. ^ Flavelle, Christopher (22 April 2021). "Climate Change Could Cut World Economy by $23 Trillion in 2050, Insurance Giant Warns". The New York Times. Archived from the original on 22 April 2021. The Times cites the original report: "The economics of climate change: no action not an option" (PDF). SwissRe.com. Swiss Re Institute. April 2021. Archived (PDF) from the original on 30 May 2021.
  129. ^ Pan, Linda; Powell, Evelyn M.; Latychev, Konstantin; Mitrovica, Jerry X.; et al. (30 April 2021). "Rapid postglacial rebound amplifies global sea level rise following West Antarctic Ice Sheet collapse". Science Advances. 7 (18). AAAS: eabf7787. Bibcode:2021SciA....7.7787P. doi:10.1126/sciadv.abf7787. PMC 8087405. PMID 33931453.
  130. ^ Edwards, Tamsin L.; Nowicki, Sophie; Marzeion, Ben; Hock, Regine; et al. (5 May 2021). "Projected land ice contributions to twenty-first-century sea level rise". Nature. 593 (7857): 74–82. Bibcode:2021Natur.593...74E. doi:10.1038/s41586-021-03302-y. hdl:10023/24263. PMID 33953415. S2CID 233871029.
  131. ^ DeConto, Robert M.; Pollard, David; Alley, Richard B.; Velicogna, Isabella; et al. (5 May 2021). "The Paris Climate Agreement and future sea-level rise from Antarctica". Nature. 593 (7857): 83–89. Bibcode:2021Natur.593...83D. doi:10.1038/s41586-021-03427-0. hdl:10871/125843. PMID 33953408. S2CID 233868268.
  132. ^ Pisoft, Petr; Sacha, Petr; Polvani, Lorenzo M.; Añel, Juan Antonio; et al. (5 May 2021). "Stratospheric contraction caused by increasing greenhouse gases". Environmental Research Letters. 16 (6). IOP Publishing: 064038. Bibcode:2021ERL....16f4038P. doi:10.1088/1748-9326/abfe2b. S2CID 235283365.
  133. ^ (UNEP, UNEP DTU Partnership 2021, ¶ 7 of Executive Summary)
  134. ^ Climate and Clean Air Coalition (CCAC), United Nations Environment Programme (UNEP) (5 May 2021). "Global Methane Assessment / Benefits and Costs of Mitigating Methane Emissions". CCAcoalition.org. United Nations Environment Programme (UNEP). Archived from the original on 7 May 2021.
  135. ^ "Hitting the EV Inflection Point /" (PDF). TransportEnvironment.org. Bloomberg New Energy Finance. May 2021. Archived (PDF) from the original on 18 May 2021.
  136. ^ Liu, Sisi; Kruse, Stefan; Scherler, Dirk; Ree, Richard H.; et al. (20 May 2021). "Sedimentary ancient DNA reveals a threat of warming-induced alpine habitat loss to Tibetan Plateau plant diversity". Nature Communications. 12 (2995): 2995. Bibcode:2021NatCo..12.2995L. doi:10.1038/s41467-021-22986-4. PMC 8137883. PMID 34016962.
  137. ^ Xu, Chi; Kohler, Timothy A.; Lenton, Timothy M.; Svenning, Jens-Christian; Scheffer, Marten (26 May 2021). "Future of the human climate niche". Proceedings of the National Academy of Sciences of the United States of America. 117 (21): 11350–11355. doi:10.1073/pnas.1910114117. PMC 7260949. PMID 32366654.
  138. ^ a b ● Bressler, R. Daniel (29 July 2021). "The mortality cost of carbon". Nature Communications. 12 (1): 4467. Bibcode:2021NatCo..12.4467B. doi:10.1038/s41467-021-24487-w. PMC 8322393. PMID 34326326.
    ● Milman, Oliver (29 July 2021). "Three Americans create enough carbon emissions to kill one person, study finds". The Guardian. Archived from the original on 29 July 2021.
  139. ^ (WGI AR6 2021, SPM)
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Organizations

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Surveys, summaries and report lists

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