By 2100, 75% of the world’s population will face deadly heatwaves

WASHINGTON — Killer heat is getting worse, a new study shows.

Deadly heat waves like the one now broiling the American West are bigger killers than previously thought and they are going to grow more frequent, according to a new comprehensive study of fatal heat conditions. Still, those stretches may be less lethal in the future, as people become accustomed to them.

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