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RyanCarey comments on Improving long-run civilisational robustness - Less Wrong
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I don't have a specific one in mind but nuclear winter, or a catastrophic problem spreading through the atmosphere, or something bioengineered would be concievable.
It seems unlikely to me that those would kill all of the earthbound population while still leaving the earth habitable enough for our returning astronauts. (If they kill, say, 99.99% of the population then the survivors will far outnumber the astronauts.)