Climate change will kill the race and many other species several main ways, or so it is thought.
1) Starvation - some warmth is good for many crops but excessive heat is not good.
2) Wars - as populations are seeing starvation and lack of water they will migrate to areas which have little excess food and water. Wars small and large are inevitable.
3) Heat deaths - we all hear about hypothermia which is death or severe illness caused by low temperatures. but you will soon begin to hear much more about hyperthermia which is death from exposure to temperatures over about 105 degrees Fahrenheint for extended periods - hours, not months. The exact temperature changes with the humidity level.
However there were several months in south asia and India where the temperature was thought to be high enough to cause hundreds of thousands or even millions of deaths. About 1.5 billion people were exposed to those conditions, few of whom had air conditioning.
Heat death is difficult to accurately count but there was no extreme jump in mortality in the region.
The question, a vital question for the human race, is WHY DIDN'T THEY DIE?
If/when we learn just what happened it may show us a way billions can survive the climate change which is now inevitable.
For other problems which climate change will present see:
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