I’d like to add to the other comments. Today we have a skewed view: the places where many people live today may not have been those places that were more hospitable to early hunter-gatherer cultures. In those places where there was an abundance of food, people would have to compete about that more with other animals. Think about living in the woods on your own even in the best climates – it might even be easier if you learn how to live from the produce of caribous.
Things became different with agriculture, favouring those places where crops could grow reliably and thus sustaining a much larger population.
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