Of all the natural disasters, heat is the No. 1 killer, studies show. And as temperatures continue to rise because of the climate crisis, scientists expect it to make even more people ill.
The National Weather Service has issued excessive heat advisories this week for a swath of the country stretching from the Upper Midwest to the Southeast. From Dayton to Durham, doctors have been encouraging people to stay indoors as much as possible, warnings that are complicated by the fact that half a million didn't have power as of Tuesday because of severe storms, according to PowerOutage.US.