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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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)
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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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