One way to avoid the worst effects of climate change would be to move to Mars. Oh yeah, that would be better. Mars is not exactly habitable, with the lack of oxygen and life and all. But Mars actually has oxygen, and water, too, it's just not accessible in its current form. We could "terraform" Mars and make it more like earth, but it would be a big project, as Kurzgesagt explains in this video. Sure, this is theoretical. The expense and technology it would require to terraform Mars would be better used to preserve and rejuvenate the planet we already have. We just need the will to do it.