Study: Billions Could Face Deadly Heat in Cities by 2100 as Extreme Temperatures Spread to U.S. Midwest
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Study finds billions could face deadly humid heat in cities by 2100, spreading to US Midwest.
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At 2C warming 750M people may face 1 week/yr of potentially deadly heat.
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At 3C warming over 1.5B people could experience such threat.
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Cities like Lagos, Shanghai, and Chicago could be impacted.
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Wet bulb temperature of 30-31C may be limit humans can survive.