Then why bring up other planets? Even if the worst global-warming predictions come true, Earth will still be vastly more hospitable than an unterraformed Mars, and all of the other planetoids we can reach in a single human lifetime are even less fit for human habitation.
Until and unless somebody invents either the warp drive or the means to terraform Mars, we’ve only got one planet to work with. If we trash it, that’s it—game over for humanity.
Then why bring up other planets? Even if the worst global-warming predictions come true, Earth will still be vastly more hospitable than an unterraformed Mars, and all of the other planetoids we can reach in a single human lifetime are even less fit for human habitation.
Until and unless somebody invents either the warp drive or the means to terraform Mars, we’ve only got one planet to work with. If we trash it, that’s it—game over for humanity.