One of the most remarkable things about the report is the volume of concrete evidence
. Published eight years after its predecessor, it is the most comprehensive recent examination of the physical science on climate change.A daily email with the best of our journalism. When the IPCC compiled its last big report in 2013, it referred to just three studies linking extreme weather events to rising temperatures. For the latest report the experts were able to assess hundreds of such event-attribution studies.
It also shows how the world is already being remade. Of the 45 regions into which the IPCC divides the world , 41 have suffered from more cases of extremely high temperatures since the 1950s. In two areas, central and eastern North America, there was no overwhelming signal and the scientists could not agree on quite what was going on. In two others the evidence wasn’t reliable or extensive enough to support any firm conclusion.
Many parts of the world have also experienced much more heavy precipitation ; more droughts have been observed elsewhere. Although the impact of human activity is not as clear-cut as with high temperatures, human influence has probably made “compound events”—such as heatwaves seen in conjunction with droughts, or flooding caused by both rain and sea-level rise—more common.
The IPCC’s findings should have several consequences. Government representatives from 195 countries signed on to them, making it harder for decision-makers to ignore. The stark data on the effects of climate change should be an alarm call for rich countries to help poor ones to better adapt to the heating planet. Everyone must do more to mitigate against further warming.
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