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New research warns that nearly 800,000 residents would need emergency medical care for heat stroke and other illnesses in an extended power failure. Other cities are also at risk.

If a multiday blackout in Phoenix coincided with a heat wave, nearly half the population would require emergency department care for heat stroke or other heat-related illnesses, a new study suggests.

While Phoenix was the most extreme example, the study warned that other cities are also at risk. Since 2015, the number of major blackouts nationwide has more than doubled. At the same time, climate change is helping make heat waves worse and increasing instances of extreme weather around the world.

The study, published Tuesday in the journal Environmental Science and Technology, suggests that the risk to cities would be compounded if a hurricane, cyberattack or wind storm were to knock out power during a heat wave and deprive thousands of air-conditioning.

This summer, two-thirds

Keep reading this article on The New York Times Energy & Environment.

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