Future of the human climate niche

When Christopher Columbus made first contact with the American continent, he did not find it empty of humans. Humans were everywhere. Humans were in Australia for thousands of years and in New Zealand for hundreds. Long before modern technology made life there bearable. Humans settled much of what there is to settle long before even primitive technology. Columbus could only meet humans in the Americas if those same humans had migrated thousands of years ago over the Bering gap into North America and then moved further south still. The Bering Gap might have been less inhospitable than the Alaska wilderness is today but it was still no walk in the park. We are not born as snowflakes. 

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