Summer has officially begun with a blast of scorching temperatures across much of the United States. The National Weather Service is warning of “extremely dangerous heat” baking 160 million people under a heat dome stretching from the Midwest to the East Coast the rest of this week. It’s already proven fatal.

But while this is the first real taste of extreme heat for Northeastern cities, parts of the country like Texas have been cooking since May. Alaska this month issued its first-ever heat advisory. Forecasters expect more above-average temperatures through the summer.

Summers are indeed getting hotter, a consequence of the warming planet. As the climate heats up, the frequency and intensity of heat waves is increasing and their timing is changing, arriving earlier in the season.

But the damage from extreme heat isn’t spread …

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