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Or about half the world's population.Results of the study indicate that if global temperatures increase by 2°C above pre-industrial levels, the 2.2 billion residents of Pakistan and India's Indus River Valley, the one billion people living in eastern China and the 800 million residents of sub-Saharan Africa will annually experience many hours of heat that surpass human tolerance.

Climate-driven extreme heat may make parts of Earth too hot for humans
If global temperatures increase by 1° Celsius (C) or more than current levels, each year billions of people will be exposed to heat and humidity so extreme they will be unable to naturally cool themselves, according to interdisciplinary research from the Penn State College of Health and Human...