I think overpopulation is much less of an immediate threat. What I do think is an immediate threat is a nuclear world war. If anything will be the end of humans, it will be the instantaneous decimation of millions (billions, depending on how many bombs are dropped) of humans followed by a nuclear winter, sure to wipe out anyone remaining in the wake. I think if such a thing doesn't happen in the next century, we will have moved beyond it and it would no longer be a threat.
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