underground ecosystems are far more practical, & realistic, for protecting the human race.
for example, howe caverns in NY is always 60 degrees inside the caves, no matter how hot or cold it is at the surface. People can live in comfortable temperatures, naturally, underground.
People can also utilize the energy produced by the earth's core for heat & power generation. minerals & water are abundant underground & can be mined much more effectively than in space.
its a fact. the earth surface will become uninhabitable someday thousands or millions of years out. most likely that will happen due to a natural force. whereby overpopulation, given enough time, is self correcting. however much we warm the atmosphere through over population can, to a point, be adapted to. Not true of a supervolcano.
so when overpopulation gets bad enough. most likely the fittest of the human race will move undergound, not into space. the dumb libs that move to space will die fast, make mutated babies. while the undergound people will have ample resources to live on.
dumb libs.
