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How far back in history do you have to go to find a time when the Earth couldn't support human life?
If I recall correctly, CO2 concentrations were pretty darn high when the dinosaurs where walking around. There were no people around then, but I don't see any reason why we couldn't live in a much warmer, wetter world.
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You got it backwards. The dinosaurs came after the mass extinction of other species.
Which is kind of my point: if there IS a mass extinction event, then that sucks for the species that go extinct. But new species will arise that are well-adapted to the new climate. And we humans are a pretty darn adaptable species...