[megatherium]

To even think that humans can have any lasting impact on the earth is the height of vanity.

Tell that to the mammoths. Our ancestors killed off many of the pleistocene megafauna species 11,000 years ago. Of course, this doesn't say anything about climate change.

[been_lurking]

Tell that to the mammoths. Our ancestors killed off many of the pleistocene megafauna species 11,000 years ago.

That is an unproveable hypothosis. Unless you know something the rest of the scientists don't.