The climate disaster is here – this is what the future looks like

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Earth is already becoming unlivable. Will governments act to stop this disaster from getting worse? by Oliver Milman , Andrew Witherspoon , Rita Liu , and Alvin Chang by Oliver Milman , Andrew Witherspoon , Rita Liu , and Alvin Chang The enormous, unprecedented pain and turmoil caused by the climate crisis is often discussed alongside what can seem like surprisingly small temperature increases 1.5C or 2C hotter than it was in the era just before the car replaced the horse and cart. These temperature thresholds will again be the focus of upcoming UN climate talks at the COP26 summit in Scotland as countries variously dawdle or scramble to avert climate catastrophe. But the single digit numbers obscure huge ramifications at stake. We have built a civilization based on a world that doesnt exist anymore, as Katharine Hayhoe, a climate scientist at Texas Tech University and chief scientist at the Nature Conservancy, puts it. The world has already heated up by around 1.2C, on average, since the preindustrial era, pushing humanity beyond almost all historical boundaries. Cranking up the temperature of the entire globe this much within little more than a century is, in fact, extraordinary, with the oceans alone absorbing the heat equivalent of five Hiroshima atomic bombs dropping into the water every second. Worst-case scenario An unlikely pathway where emissions are not mitigated Intermediate A pathway where emissions start declining around 2040 Best-case An unlikely pathway where emissions start declining now and global temperatures peak at +1.8C Projected to increase by +1. 5C +2.7F 2021 2050 2080 11 years 9 years In 6 +2.0C +3.6F In 20 to 31 years +2.5C +4.5F In 32 to 58 years +3.0C +5.4F In 43 years at the earliest Worst-case scenario An unlikely pathway where emissions are not mitigated Intermediate A pathway where emissions start declining around 2040 Best-case An unlikely pathway where emissions start declining now and global temperatures peak at +1.8C Projected to increase by +1. 5C +2.7F 2021 2050 2080 11 years In 6 to 9 years +2.0C +3.6F In 20 to 31 years +2.5C +4.5F In 32 to 58 years +3.0C +5.4F In 43 years at the earliest Worst-case scenario An unlikely pathway where emissions are not mitigated Intermediate A pathway where emissions start declining around 2040 Best-case An unlikely pathway where emissions start declining now and global temperatures peak at +1.8C Projected to increase by +1. 5C +2.7F 2021 2050 2080 11 years In 6 to 9 years +2.0C +3.6F In 20 to 31 years +2.5C +4.5F In 32 to 58 years +3.0C +5.4F In 43 years at the earliest Worst-case scenario An unlikely pathway where emissions are not mitigated Intermediate A pathway where emissions start declining around 2040 Best-case An unlikely pathway where emissions start declining now and global temperatures peak at +1.8C Projected to increase by +1. 5C +2.7F 2021 2050 2080 11 years In 6 to 9 years +2.0C +3.6F In 20 to 31 years +2.5C +4.5F In 32 to 58 years +3.0C +5.4F In 43 years at the earliest Guardian graphic. Source: IPCC, 2021: Summary for Policymakers. Note: The IPCC scenarios used for best-case, intermediate and worst-case scenarios are SSP1-2.6, SSP2-4.5 and SSP5-8.5. Until now, human civilization has operated within a narrow, stable band of temperature. Through the burning of fossil fuels, we have now unmoored ourselves from our past, as if we have transplanted ourselves onto another planet. The last time it was hotter than now was at least 125,000 years ago, while the atmosphere has more heat-trapping carbon dioxide in it than any time in the past two million years, perhaps more. Since 1970, the Earths temperature has raced upwards faster than in any comparable period. The oceans have heated up at a rate not seen in at least 11,000 years. We are conducting an unprecedented experiment with our planet, said Hayhoe. The temperature has only moved a few tenths of a degree for us until now, just small wiggles in the road. But now we are hitting a curve weve never seen before. No one is entirely sure how this horrifying experiment will end but humans like defined goals and so, in the 2015 Paris climate agreement , nearly 200 countries agreed to limit the global temperature rise to well below 2C, with an aspirational goal to keep it to 1.5C. The latter target was fought for by smaller, poorer nations, aware that an existential threat of unlivable heatwaves, floods and drought hinged upon this ostensibly small increment. The difference between 1.5C and 2C is a death sentence for the Maldives, said Ibrahim Mohamed Solih, president of the country, to world leaders at the United Nations in September. There is no huge chasm after a 1.49C rise, we are tumbling down a painful, worsening rocky slope rather than about to suddenly hit a sheer cliff edge but by most standards the worlds governments are currently failing to avert a grim fate. We are on a catastrophic path, said Antonio Guterres, secretary general of the UN. We can either save our world or condemn humanity to a hellish future. Earths atmosphere, now saturated with emissions from human activity, is trapping warmth and leading to more frequent periods of extreme heat Photographs: Clockwise from top-left, Maranie Staab/Reuters, Yuichi Yamazaki/Getty Images, Rizwan Tabassum/AFP via Getty Images, Cristina Quicler/AFP via Getty Images This year has provided bitter evidence that even current levels of warming are disastrous, with astounding floods in Germany and China , Hades-like fires from Canada to California to Greece and rain, rather than snow, falling for the first time at the summit of a rapidly melting Greenland. No amount of global warming can be considered safe and people are already dying from climate change, said Amanda Maycock, an expert in climate dynamics at the University of Leeds. A heat dome that pulverized previous temperature records in the USs Pacific northwest and Canada's west coast in June, killing hundreds of people as well as a billion sea creatures roasted alive in their shells off the coast , wouldve been virtually impossible if human activity hadnt heated the planet, scientists have calculated, while the German floods were made nine times more likely by the climate crisis. The fingerprint of climate change on recent extreme weather is quite clear, said Michael Wehner, who specializes in climate attribution at Lawrence Berkeley National Laboratory. But even I am surprised by the number and scale of weather disasters in 2021. Global warming level Increase in heatwave temperature Heatwave frequency Historical 1850-1900 A once-a-decade event ... - ... now happens 2.8x a decade +1.0C Present +1.2C +1.5C In 6-11 years 4.1x +1.9C +2.0C About 30 years 5.6x +2.6C +4.0C Unlikely this century 9.4x +5.1C Global warming level Increase in heatwave temperature Heatwave frequency Historical 1850-1900 A once-a-decade event ... - +1.0C Present ... now happens 2.8x a decade +1.2C +1.5C In 6-11 years 4.1x +1.9C +2.0C About 30 years 5.6x +2.6C +4.0C Unlikely this century 9.4x +5.1C Global warming level Increase in heatwave temperature Heatwave frequency Historical 1850-1900 A once-a-decade event ... - +1.0C Present ... now happens 2.8x a decade +1.2C +1.5C In 6-11 years 4.1x +1.9C +2.0C About 30 years 5.6x +2.6C +4.0C Unlikely this century 9.4x +5.1C Global warming level Increase in heatwave temperature Heatwave frequency Historical 1850-1900 A once-a-decade event ... - +1.0C Present ... now happens 2.8x a decade +1.2C +1.5C In 6-11 years 4.1x +1.9C +2.0C About 30 years 5.6x +2.6 C +4.0C Unlikely this century 9.4x +5.1C Guardian graphic. Source: IPCC, 2021: Summary for Policymakers. Note: The projected year ranges for +1.5C scenario is using the mean projections for SSPI2.6 and SSP5-8.5. The +2C and +4C scenarios use the mean projection for SSP2-4.5. After a Covid-induced blip last year, greenhouse gas emissions have roared back in 2021, further dampening slim hopes that the world will keep within the 1.5C limit. Theres a high chance we will get to 1.5C in the next decade, said Joeri Rogelj, a climate scientist at Imperial College London. For humans, a comfortably livable planet starts to spiral away the more it heats up. At 1.5C, about 14% of the worlds population will be hit by severe heatwaves once every five years . with this number jumping to more than a third of the global population at 2C. Beyond 1.5C, the heat in tropical regions of the world will push societies to the limits , with stifling humidity preventing sweat from evaporating and making it difficult for people to cool down. Extreme heatwaves could make parts of the Middle East too hot for humans to endure, scientists have found, with rising temperatures also posing enormous risks for China and India . A severe heatwave historically expected once a decade will happen every other year at 2C . Something our great-grandparents maybe experienced once a lifetime will become a regular event, said Rogelj. Globally, an extra 4.9 million people will die each year from extreme heat should the average temperature race beyond this point, scientists have estimated . At 2C warming , 99% of the worlds coral reefs also start to dissolve away, essentially ending warm-water corals. Nearly one in 10 vertebrate animals and almost one in five plants will lose half of their habitat. Ecosystems spanning corals, wetlands, alpine areas and the Arctic are set to die off at this level of heating, according to Rogelj. +1.5C +2.7F With our current policies Around 2030s Change from 1986-2006 Guardian graphic. Source: Climate Impact Explorer by Climate Analytics. Note: In the data, a heatwave is when a relative indicator based on air temperature and an absolute indicator based on the air temperature and relative humidity are projected to exceed exceptionally high values, according to an analysis of four climate models. When the two of the four models dont agree, they are not visualized. The projected year ranges are the Climate Action Tracker current policies scenario. +1.5C +3.0C Earths hotter climate is causing the atmosphere to hold more water, then releasing the water in the form of extreme precipitation events Photographs: Clockwise from top-left, Indranil Aditya/NurPhoto via Getty Images, Philippe Lopez/AFP via Getty Images, Jack Taylor/AFP via Getty Images, Oman News Agency via AP Across the planet, people are set to be strafed by cascading storms, heatwaves, flooding and drought. Around 216 million people, mostly from developing countries, will be forced to flee these impacts by 2050 unless radical action is taken, the World Bank has estimated . As much as $23tn is on track to be wiped from the global economy , potentially upending many more. Some of the most dire impacts revolve around water both the lack of it and inundation by it. Enormous floods, often fueled by abnormally heavy rainfall, have become a regular occurrence recently, not only in Germany and China but also from the US, where the Mississippi River spent most of 2019 in a state of flood, to the UK, which was hit by floods in 2020 after storms delivered the equivalent of one month of rain in 48 hours, to Sudan, where flooding wiped out more than 110,000 homes last year. Global warming level Heavy precipitation frequency Increase in wetness Historical 1850-1900 A once-a-decade event ... - ... now happens 1.3x a decade +1.0C Present +6.7% +1.5C In 6-11 years 1.5x +10.5% +2.0C About 30 years 1.7x 14.0% +4.0C Unlikely this century 2.7x +30.2% Global warming level Heavy precipitation frequency Increase in wetness Historical 1850-1900 A once-a-decade event ... - +1.0C Present ... now happens 1.3x a decade +6.7% +1.5C In 6-11 years 1.5x +10.5% +2.0C About 30 years 1.7x 14.0% +4.0C Unlikely this century 2.7x +30.2% Global warming level Heavy precipitation frequency Increase in wetness Historical 1850-1900 A once-a-decade event ... - +1.0C Present ... now happens 1.3x a decade +6.7% +1.5C In 6-11 years 1.5x +10.5% +2.0C About 30 years 1.7x 14.0% +4.0C Unlikely this century 2.7x +30.2% Global warming level Heavy precipitation frequency Increase in wetness Historical 1850-1900 A once-a-decade event ... - +1.0C Present ... now happens 1.3x a decade +6.7% +1.5C In 6-11 years 1.5x +10.5% +2.0C About 30 years 1.7x 14.0% +4.0C Unlikely this century 2.7x +30.2% Guardian graphic. Source: IPCC, 2021: Summary for Policymakers. Note: The projected year ranges for +1.5C scenario is using the mean projections for SSPI2.6 and SSP5-8.5. The +2C and +4C scenarios use the mean projection for SSP2-4.5. Meanwhile, in the past 20 years the aggregated level of terrestrial water available to humanity has dropped at a rate of 1cm per year, with more than five billion people expected to have an inadequate water supply within the next three decades . At 3C of warming, sea level rise from melting glaciers and ocean heat will also provide torrents of unwelcome water to coastal cities, with places such as Miami, Shanghai and Bangladesh in danger of becoming largely marine environments. The frequency of heavy precipitation events, the sort that soaked Germany and China, will start to climb, nearly doubling the historical norm once it heats up by 2C. +1.5C +2.7F With our current policies Around 2030s Change from 1986-2006 Guardian graphic. Source: Climate Impact Explorer by Climate Analytics. Note: The data shows where rainfall and snowfall are projected to change compared to the 1986-2006 average, according to an analysis of four climate models. When the two of the four models dont agree, they are not visualized. The projected year ranges are the Climate Action Tracker current policies scenario. +1.5C +3.0C Earths hotter atmosphere soaks up water from the earth, drying out trees and tinder that amplify the severity of wildfires Photographs: Clockwise from top-left, Greg Bell/DFES via AP, Muhammad A.F/Anadolu Agency via Getty Images, Ethan Swope/AP, Fadel Senna/AFP via Getty Images Virtually all of North America and Europe will be at heightened risk of wildfires at 3C of heating, with places like California already stuck in a debilitating cycle of heat, drought and fire, according to scientists. The magnitude of the disastrous Black Summer bushfire season in Australia in 2019-20 will be four times more likely to reoccur at 2C of heating , and will be fairly commonplace at 3C. A disquieting unknown for climate scientists is the knock-on impacts as epochal norms continue to fall. Record wildfires in California last year, for example, resulted in a million children missing a significant amount of time in school. What if permafrost melting or flooding cuts off critical roads used by supply chains? What if storms knock out the worlds leading computer chip factory? What happens once half of the world is exposed to disease-carrying mosquitos? Weve never seen the climate change this fast so we dont understand the non-linear effects, said Hayhoe. There are tipping points in our human-built systems that we dont think about enough. More carbon means worse impacts which means more unpleasant surprises. +1.5C +2.7F With our current policies Around 2030s Change from 1986-2006 Guardian graphic. Source: Climate Impact Explorer by Climate Analytics. Note: The data shows where the annual aggregated of areas burned by wildfires is projected to change, according to an analysis of four climate models. When the two of the four models dont agree, they are not visualized. The projected year ranges are the Climate Action Tracker current policies scenario. +1.5C +3.0C Unpredictable weather, like too much or too little rainfall, decreases the quantity and quality of crop yields Photographs: Clockwise from top-left, Marvin Recinos/AFP via Getty Images, David Gray/Getty Images, String/EPA, World Food Program/Reuters There are few less pleasant impacts in life than famine and the climate crisis is beginning to take a toll on food production. In August, the UN said that Madagascar was on the brink of the worlds first climate change famine, with tens of thousands of people at risk following four years with barely any rain. Globally, extreme crop drought events that previously occurred once a decade on average will more than double in their frequency at 2C of temperature rise. Heat the world a bit more than this and a third of all the worlds food production will be at risk by the end of the century as crops start to wilt and fail in the heat. Global warming level Crop drought frequency Historical 1850-1900 A once-a-decade event ... +1.0C Present ... now happens 1.7x a decade +1.5C In 6-11 years 2.0x +2.0C About 30 years 2.4x +4.0C Unlikely this century 4.1x Global warming level Crop drought frequency Historical 1850-1900 A once-a-decade event ... +1.0C Present ... now happens 1.7x a decade +1.5C In 6-11 years 2.0x +2.0C About 30 years 2.4x +4.0C Unlikely this century 4.1x Global warming level Crop drought frequency Historical 1850-1900 A once-a-decade event ... +1.0C Present ... now happens 1.7x a decade +1.5C In 6-11 years 2.0x +2.0C About 30 years 2.4x +4.0C Unlikely this century 4.1x Global warming level Crop drought frequency Historical 1850-1900 A once-a-decade event ... +1.0C Present ... now happens 1.7x a decade +1.5C In 6-8 years 2.0x +2.0C About 30 years 2.4x +4.0C Unlikely this century 4.1x Guardian graphic. Source: IPCC, 2021: Summary for Policymakers. Note: The projected year ranges for +1.5C scenario is using the mean projections for SSPI2.6 and SSP5-8.5. The +2C and +4C scenarios use the mean projection for SSP2-4.5.p> Many different aspects of the climate crisis will destabilize food production, such as dropping levels of groundwater and shrinking snowpacks, another critical source of irrigation, in places such as the Himalayas. Crop yields decline the hotter it gets, while more extreme floods and storms risk ruining vast tracts of farmland. +1.5C +2.7F With our current policies Around 2030s Change from 1986-2006 Guardian graphic. Source: Climate Impact Explorer by Climate Analytics. Note: The data shows where the annual yield of four crops (maize, wheat, soybean, and rice) is projected to fall short of the 2.5th percentile of pre-industrial levels, according to an analysis of four climate models. When the two of the four models dont agree, they are not visualized. The projected year ranges are the Climate Action Tracker current policies scenario. +1.5C +3.0C Despite the rapid advance of renewable energy and, more recently, electric vehicles, countries still remain umbilically connected to fossil fuels, subsidizing oil, coal and gas to the tune of around $11m every single minute . The air pollution alone from burning these fuels kills nearly nine million people each year globally. Decades of time has been squandered US president Lyndon Johnson was warned of the climate crisis by scientists when Joe Biden was still in college and yet industry denial and government inertia means the world is set for a 2.7C increase in temperature this century, even if all emissions reduction pledges are met. By the end of this year the world will have burned through 86% of the carbon budget that would allow us just a coin flips chance of staying below 1.5C. The Glasgow COP talks will somehow have to bridge this yawning gap, with scientists warning the world will have to cut emissions in half this decade before zeroing them out by 2050. 2.7C would be very bad, said Wehner, who explained that extreme rainfall would be up to a quarter heavier than now, and heatwaves potentially 6C hotter in many countries. Maycock added that much of the planet will become uninhabitable at this level of heating. We would not want to live in that world, she said. A scenario approaching some sort of apocalypse would comfortably arrive should the world heat up by 4C or more, and although this is considered unlikely due to the belated action by governments, it should provide little comfort. Every decision every oil drilling lease, every acre of the Amazon rainforest torched for livestock pasture, every new gas-guzzling SUV that rolls onto the road will decide how far we tumble down the hill. In Glasgow, governments will be challenged to show they will fight every fraction of temperature rise, or else, in the words of Greta Thunberg , this pivotal gathering is at risk of being dismissed as blah, blah, blah. Weve run down the clock but its never too late, said Rogelj. 1.7C is better than 1.9C which is better than 3C. Cutting emissions tomorrow is better than the day after, because we can always avoid worse happening. The action is far too slow at the moment, but we can still act. This article was amended on 15 October 2021 with the correct IPCC projections for when global temperatures are expected to reach each threshold and to correct the spelling of Wooroloo. The time ranges in each map have also been amended to show time range projections from the Climate Action Tracker's current policies pathway. It was further amended on 25 October 2021 to add the west coast of Canada to the areas affected by the "heat dome" in June.