Over the course of the 1970s, there were 660 reported disasters around the world, including droughts, floods, extreme temperature events, wildfires, and storms. In the 2000s, there were 3,322—a fivefold boost. That is a staggering increase in just over thirty years, and clearly global warming cannot be said to have “caused” all of it. But the climate signal is also clear. “There’s no question that climate change has increased the frequency of certain types of extreme weather events,” climate scientist Michael Mann told me in an interview, “including drought, intense hurricanes, and super
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