Except that with warmer weather in many cold, formerly unsuitable climates, a lot of that land will become suitable for human life. Also, we are not talking about a mass migration of billions of people. IF (and that is a big if), scientists have predicted trends correctly, it is going to happen over a long period of time, and not over night. Which means you will have a bunch of really small migrations over a long period of time. Hardly as hectic as billions of people just pulling stakes and moving.
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