(CNN) — Large parts of the world, including China and the Midwest US, are on track to become too hot for humans to handle as accelerating global temperatures expose billions to heat and humidity so extreme their bodies will no longer be able to cope, according to a new study. Researchers used temperature and humidity...
Large parts of the world, including China and the Midwest US, are on track to become too hot for humans to handle as accelerating global temperatures expose billions to heat and humidity so extreme their bodies will no longer be able to cope, according to a new study.
When levels of heat and humidity are high, sweat evaporates much more slowly than usual meaning its cooling effect is lost and the body can become unable to regulate its temperature. This can lead to heat exhaustion and, which can cause heart attacks and organ failure. The old, the very young and those with pre-existing health conditions are most vulnerable to heat illness.
While countries have committed to limiting global warming to below 2 degrees Celsius, with the aim of 1.5 degrees Celsius, they are. Even if global climate pledges are met — which the world is not currently on course to do — temperatures are expected to rise between 2.1 and 2.9 degrees Celsius, according to a
A bicyclist rides past a screen airing a weather report at Daley Plaza in Chicago in August. John J. Kim/Chicago Tribune/AP So-called “hot hours” — times where heat and humidity are especially life-threatening — will be concentrated in the Missouri and Mississippi River valleys but also elsewhere in US including the Gulf of Mexico coast and the Atlantic seaboard, according to the study.
“Around the world, official strategies for adapting to the weather focus on temperature only,” Qinqin Kong of Purdue University and a study co-author, said in a statement. “But this research shows that humid heat is going to be a much bigger threat than dry heat.”
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