Pretty soon, ie now in Pakistan and India, the wet bulb temperature, a measure of realtime humidity and temperature, will regularly exceed 120 degrees, at which point it becomes too hot for the human body to physically cool itself with sweat. Our climate is changed and changing now. It was cooler in Florida 10-20 years ago, let alone centuries ago. It's hotter now. When hundreds of millions are starving, flooded, overheated, dried out, or otherwise displaced, how do you think life will be going for those without fucking air conditioning.