These frightening heat maps reveal the countries that could soon become too hot to live in if global temperatures increase...

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 kampus terbaik di jakarta 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.

Residents in , New York, Houston and  would all have to endure dangerous and stifling levels of humidity, while extreme heat could wreak havoc among those living in parts of South America and Australia, according to the new study by Penn State University. 

Humans can only endure so much heat before putting themselves at risk of a heart attack or heat stroke.