We're talking true existential threat, LONG term. Something that sets us back to the stone age doesn't qualify. (See other questions for that. It's my opinion that even were we reduced to some few thousand, we could recover this civilization within several thousand, certainly 100 thousand years and the overall trajectory of our species would not change too drastically.)

Add options as you see fit, but options which get few votes in the long term will likely be deleted (including mine).

For now, the plan is to resolve by the end of 2025 according to simple democratic opinion. Obviously I ask that everyone plays in the spirit of earnest and truth-seeking. Depending on how long manifold lasts we may see certain options disappear one by one, especially as soon as (if) we go interstellar.