^ i always thought this was likely if a nucear winter happened
but a super-germ either evolved, or man-made, could take us all out.
a few might survive, if there are really environments that are indefinitely
self-sustaining in total quarantine and isolation
i would love to see our species have sizable successful breeding populations off planet.
it's an ultimate insurance policy
beyond the costs in money and accidental death, there will be a lot of deaths
due to evolution: mis-carriages, still-borns, infant, children, ...
not clear to me if this will happen soon or at all.
not enough people want it,
and there is no money to be made in space
by having colonies of humans there