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Populated parts of the globe are already starting to become uninhabitable

Extreme heat waves that kill even healthy people within hours will strike parts of the Indian subcontinent unless global carbon emissions are cut sharply and soon, according to new research. Even outside of these hotspots, three-quarters of the 1.7bn population particularly those farming in the Ganges and Indus valleys will be exposed to a level of humid heat classed as posing extreme danger towards the end of the century. The new analysis assesses the impact of climate change on the deadly combination of heat and humidity, measured as the wet bulb temperature (WBT). Once this reaches 35C, the human body cannot cool itself by sweating and even fit people sitting in the shade will die within six hours. There are already parts of the world above 32-33C.
https://blogs.ei.columbia.edu/2017/12/22/humidity-may-prove-breaking-point-for-some-areas-as-temperatures-rise-says-study/