Carbon pollution from burning fossil fuels, methane leaks and agriculture has driven up the thermometer 1.1 degrees Celsius so far.
But an IPCC special report in 2018 showed how much more devastating an extra 2 degrees Celsius would be, for humanity and the planet.“1.5 Celsius became the de facto target” — and proof of the IPCC’s influence in shaping global policy, IPCC lead author and Maynooth University professor Peter Thorne told AFP.
“The reality is that we are not on track to achieve the Paris Agreement goals of limiting climate change to 1.5 degrees by the end of the century,” said Espinosa.A third sea change over the last seven years is in the science itself. For example, within days of the deadly “heat dome” that scorched Canada and the western US last month, the World Weather Attribution consortium calculated that the heatwave would have been virtually impossible without manmade warming.From Monday, representatives from 195 nations, with lead scientists at their elbow, will vet a 20 to 30-page “summary for policymakers” line by line, word by word.
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