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, shrinking ice and worsening extremes such as heat waves, droughts, floods and storms. “The changes we experience will increase with further warming.” 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 other, less stringent Paris goal - with far worse heat waves, droughts and flood-inducing downpours “unless deep reductions in carbon dioxide and other greenhouse gas emissions occur in the coming decades,” the report said. Warming has ramped up in recent years, data shows. Under each scenario, the report said, the world will cross the 1.5 degrees Celsius warming mark in the 2030s, earlier than some past predictions.
The limit is only a few tenths of a degree hotter than now because the world has already warmed nearly 1.1 degrees Celsius (2 degrees Fahrenheit) in the past century and a half. World leaders agreed then to try to limit warming to 1.5 degrees Celsius (2.7 degrees Fahrenheit) since 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. “I don’t see any area that is safe … 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’s climate 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 calls a “code red for humanity.”
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