I've always looked forward to the next Age of Discovery, when we set out to colonize on other planets. What I've never understood, though, is the "plan" that Mars is a good backup to Earth. Outside of some cataclysmic event - our planet will continue to be more hospitable than Mars. I have little doubt we would be able to set up a small station on the moon or Mars within my lifetime, but I don't see us supporting large amounts of people on another planet anytime soon.
If we inflict something on ourselves that makes the Earth no longer hospitable for humans, I think that's when we should call it quits on humanity because we obviously aren't mature enough a species to take care of our gifts.
If we inflict something on ourselves that makes the Earth no longer hospitable for humans, I think that's when we should call it quits on humanity because we obviously aren't mature enough a species to take care of our gifts.