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Climate change may make summer nights a lot sweatier, and potentially even deadly. The number of extremely hot days followed by intensely hot nights could jump to 32 days four times as many as there are currently in northern hemisphere summers by 2100, even if the world acts to check global warming.
In the worst-case warming scenario, which is seen as unlikely, the number leaps to 69 days, or three-quarters of summer days.
Typically, scientists have looked at how climate …
