These frightening heat maps reveal the countries that could soon become too hot to live in if global temperatures increase by as little as 1.5°C (2.7°F).Some 2.2 billion people in and 's Indus River Valley, 1 billion in eastern and 800 million in sub-Saharan Africa would be among those facing heat that is beyond human tolerance, researchers say.That could extend to eastern and central parts of the US if temperatures on Earth were to rise by 3°C (5.4°F) above pre-industrial levels.
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