SOURCE: Nature

DATE: December 19, 2017

SNIP: Basic theory suggests that climate change will lead to more extreme weather, but making the link to individual events is difficult. There was a time when the typical answer was something along the lines of, ‘Perhaps, but it’s hard to say.’ The science has advanced over the past several years, and scientists have identified global warming’s relative contribution to many extreme weather events. Now, for the first time, climate researchers are reporting that some weather events would have been outright impossible without the warming influence of humanity’s greenhouse-gas emissions.

This kind of confident assertion rarely makes its way into the scientific literature. Yet it appeared in three studies included in a special annual edition of the Bulletin of the American Meteorological Society (BAMS) dedicated to attributing the causes of extreme weather events. If these results hold up, the implications would be profound and unsettling: humanity has already pushed the global climate into a new regime.