None. I never really understood the logic of thinking you can escape Earth's problems by going to Mars. If travel is easy enough to sustain life there, it's eas

None. I never really understood the logic of thinking you can escape Earth's problems by going to Mars. If travel is easy enough to sustain life there, it's easy enough to bring anyone's problem up there as well. I've always wondered why people who believe that stuff not simply try to build an Antarctic underground base or something. At least there's air