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user-inactivated · 4050 days ago · link · · parent · post: State of the Species: Does success spell doom for Homo sapiens?
I'm wondering where the discrepancy between facts with the source the author cited and the paper you linked comes from. Mann didn't include a bibliography that I can see so going after his sources is a bit harder, but he's not making random claims; he does get his information from scientific studies, if slightly outdated ones.