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Originally Posted by Ab
I'm picturing a scenario in which the Earth faces some sort of existential external threat at a solar-system level - Melancholia-style wandering planet, for example - and it comes down to "we have to get a group of people and a whole bunch of genetic material not only off-planet but out of the solar system or everything on Earth is rendered extinct".
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Yep - anything less than a solar system scale event will just force us off planet ala the first 3/4 of Seveneves. If we are going to leave the system in the next couple of hundred years it'll be generation ships getting up to maybe 1%c.