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Cities sizzle with more heat waves, hotter nights
Cities sizzle with more heat waves, hotter nights

Temperatures on Earth are creeping upward, and nowhere are they being felt more intensely than in the cities where half of the planet's population resides, a new study suggests. Nearly half the planet’s urban areas experienced a significant rise in the number of extreme heat days and of heat waves that lasted six days or more, according to the study published online Thursday in the journal Environmental Research Letters. Nearly two thirds of those cities also experienced significant increases in the number of extemely hot nights, and three quarters experienced a significant drop in extreme wind events from 1973 to 2012, the study shows. The data suggest that global climate...

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