In the timeline I come from, Earth gets rendered uninhabitable by global war and high-powered AIs going rogue and turning on humanity in general. About 90% of humanity died in the Fall, and it's debatable whether it's even possible to make the planet safe for human habitation again.

[Osprey takes another bite of his curry.] I'm not gonna lie, the chunk of history you're up to live through if we get home from this is not one of humanity's shining moments.