what does the causal arrow from the collapse of civilization to literal human extinction concretely look like? most don't talk about this
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like, what do the last million humans die of in cases where the original disaster isn't severe enough to kill them outright
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personally I expect civilization to render humans extinct, not its collapse
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5. humanity both outpaced and too poor to be useful anymore, non-symbiotic humans reduced to vermin, forced out of more and more habitats
6. eventually exterminated as a side thought during some house cleaning
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even "venus earth" seems survivable if one uses the same bigass aerostats as in some venus colonization scenarios (plus there's no need to ship them to venus)
my intuition is aside from nonhuman intelligence, the only thing which would reduce humans to 0 is an impact or other cosmic events
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anything else would be less discrete, much longer timescale
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