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Lydaking, if humans don't start using birth control worldwide (which Bush and his religious-wrong friends have done their best to fight), there will be a massive die-off -- and by the time that occurs, our planet will be so trashed that the sustainability level will not allow more than a few tens of millions of us at best.
It doesn't matter what you like or don't like: A 9/10 die-off rate is actually an optimistic scenario. It's much more likely to be around 99/100.