This is how your world could end

"Today, the most common maximums for wet-bulb temperatures around the world are 26C to 27C. Wet-bulb temperatures of 35C or higher are lethal to humanity. Above this limit, it is impossible for humans to dissipate the heat they generate indefinitely and they die of overheating in a matter of hours, no matter how hard they try to cool off.

“So we were trying to get across the point that physiology and adaptation and these other things will have nothing to do with this limit. It’s the easy-bake oven limit,” he said. “You cook yourself, very slowly.”"