> ... in the event that Earth was no longer habitable
The most likely scenario is that regular city folk find it no longer habitable. Self contained/reliant underground outposts could still survive. An event that makes all of those outposts untenable is far less likely.
The most likely scenario is that regular city folk find it no longer habitable. Self contained/reliant underground outposts could still survive. An event that makes all of those outposts untenable is far less likely.