[CatWChainsaw]

Oopsie doopsie, Arizona spent the entire month of July over 110F, India is outlawing almost all rice exports, South America is over 100F in their winter, Antarctica is missing an Argentina-sized amount of ice in its winter, cacti in the Mojave Desert are wilting and dying in heat even they can't handle, and Iran just flat out shut down for two days due to the heat.

But sure, people are going to migrate slowly and not die in great numbers as receiving nations pull up the drawbridges and rain arrows on the intruders.