What is the evidence for this? If the out-of-Africa model is correct, most of human evolution took place in warm, sometimes arid climates, e.g., tropical savanna. Diaspora into Mediterranean climates still does not imply especially harsh winters. Same goes for the Fertile Crescent. I don’t know enough about other models aside from out-of-Africa to comment but I’d guess hominin evolution relied upon easy ecologies. Perhaps resident anthropologist @Hypatia can shed more light on this.
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