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The report described five different future scenarios based on how much the world reduces carbon emissions. At most, natural forces or simple randomness can explain one- or two-tenths of a degree of warming, the report said. Nearly all of the warming that has happened on Earth can be blamed on emissions of heat-trapping gases such as carbon dioxide and methane. Scientists have issued this message for more than three decades, but the world hasn’t listened, said United Nations Environment Program Executive Director Inger Andersen.įor the first time, the report offers an interactive atlas for people to see what has happened and may happen to where they live. The world is “locked in” to 15 to 30 centimeters (6 to 12 inches) of sea level rise by mid-century, said report co-author Bob Kopp of Rutgers University. Some harm from climate change - dwindling ice sheets, rising sea levels and changes in the oceans as they lose oxygen and become more acidic - is “irreversible for centuries to millennia,” the report said. Extreme heat is also driving massive fires in Greece and Turkey. That’s like what’s now happening in the Western U.S., where heat waves, drought and wildfires compound the damage, Mearns said. All of these trends will get worse, the report said.įor example, the kind of heat wave that used to happen only once every 50 years now happens once a decade, and if the world warms another degree Celsius (1.8 degrees Fahrenheit), it will happen twice every seven years, the report said.Īs the planet warms, places will get hit more not just by extreme weather but by multiple climate disasters at once, the report said. Tropical cyclones are getting stronger and wetter, while Arctic sea ice is dwindling in the summer and permafrost is thawing. The 3,000-plus-page report from 234 scientists said warming is already accelerating sea level rise and worsening extremes such as heat waves, droughts, floods and storms. Secretary of State Anthony Blinken called it “a stark reminder.” With crucial international climate negotiations coming up in Scotland in November, world leaders said the report is causing them to try harder to cut carbon pollution. WATCH: Can concrete, a major Co2 emitter, be made greener? National Oceanic and Atmospheric Administration. “This report tells us that recent changes in the climate are widespread, rapid and intensifying, unprecedented in thousands of years,” said IPCC Vice Chair Ko Barrett, senior climate adviser for the U.S. In three scenarios, the world will also likely exceed 2 degrees Celsius (3.6 degrees Fahrenheit) over pre-industrial times - the less stringent Paris goal - with far worse heat waves, droughts and flood-inducing downpours unless there are deep emissions cuts, the report said. But we can avoid further levels of warming by acting on greenhouse gas emissions,” said report co-chair Valerie Masson-Delmotte, a climate scientist at France’s Laboratory of Climate and Environment Sciences at the University of Paris-Saclay. “Our report shows that we need to be prepared for going into that level of warming in the coming decades. Warming has ramped up in recent years, data shows. Under each scenario, the report said, the world will cross the 1.5-degree-Celsius warming mark in the 2030s, earlier than some past predictions. The world has already warmed nearly 1.1 degrees Celsius (2 degrees Fahrenheit) since then. World leaders agreed then to try to limit warming to 1.5 degrees Celsius (2.7 degrees Fahrenheit) above levels in the late 19th century because problems mount quickly after that. The authoritative Intergovernmental Panel on Climate Change (IPCC) report, which calls climate change clearly human-caused and “unequivocal,” makes more precise and warmer forecasts for the 21st century than it did last time it was issued in 2013.Įach of five scenarios for the future, based on how much carbon emissions are cut, passes the more stringent of two thresholds set in the 2015 Paris climate agreement. “Nowhere to run, nowhere to hide.”īut scientists also eased back a bit on the likelihood of the absolute worst climate catastrophes. National Center for Atmospheric Research. “It’s just guaranteed that it’s going to get worse,” said report co-author Linda Mearns, a senior climate scientist at the U.S. Earth is getting so hot that temperatures in about a decade will probably blow past a level of warming that world leaders have sought to prevent, according to a report released Monday that the United Nations called a “code red for humanity.”