Extreme heat is usually associated with drought and wildfires. But across five continents this year, it’s also unleashed a different kind of disaster: deadly flooding.

Cities around the world have seen record rainfall more than 130 times in 2023. A rare hurricane-like storm inundated Libya last month, killing thousands. More than 100 people died across Asia during an intense monsoon season in July. After fatal floods pummeled the US Northeast over the summer, torrential rains paralyzed New York City last week.

Soaring temperatures were at the root of all these weather calamities. June, July and August were the hottest ever for that period. Higher air temperatures mean the

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