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Laurel Aitken said:
I doubt Mass extinction, as mass extinctions take millions of years. Maybe, just when resources get scarce, we'll have a flat or a negative rate of popultaion growth.


Erm....no because then it wouldn't be a mass extinction. The whole idea of one is that a large number of animal species being wiped out in a very short space of time. Think about it, the Dinosaurs were wiped out 65 million years ago, not over a period of 5 million years 65-60 million years ago.