what does the causal arrow from the collapse of civilization to literal human extinction concretely look like? most don't talk about this
is the idea that the last two factions of humanity would kill each other by firing missiles at the same time?
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I think if NORAD weren't guarded some guy could maybe wander in and shoot off enough to destroy the climate for large land vertebrates if he felt like it
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earth has a lot of climates
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