Unchecked global heating will bring once unthinkable heat extremes, with 16 US cities to rival summer highs seen in Middle East
But global heating may plunge many places in the US into the sort of heat extremes previously considered unthinkable, shifting their climates long-term into conditions now common in places far farther south, or even far overseas.
Researchers gathered temperature data from 1990 to 2020 to establish today’s “normal” temperature and looked at 20 different projections of temperatures this century under different climate change scenarios. They decided to compare the status quo to a scenario where planet-heating emissions are not radically reduced and the global average temperature rises by about 3.6C by the end of the century.
The world has already heated up by about 1.2C from preindustrial times, a situation that has already helped spur the sort of fierce heatwaves and wildfires recently experienced in the US and Europe. “Extreme heat is a silent killer, yet it affects more Americans than any other weather emergency, particularly our nation’s most vulnerable,” said Gina McCarthy, the White House’s national climate adviser.
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