Heat stress can reach a limit above which all humans, even those who are fit, healthy and well acclimatised, simply cannot survive, say these University of Bristol climate science experts.
. Some of this we lose directly to the air around us and some through breathing. But most heat is lost through sweating, as when the sweat on the surface of our skin evaporates it takes in energy from our skin and the air around us in the form of latent heat.
In less humid places far from the tropics, the humidity and thus the wet bulb temperature and danger will be much lower. In reality, most people are already vulnerable well below the survivability thresholds, which is why we can see large death tolls in significantly cooler heat waves.
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