All the talk of going to Mars and being the first Martians is interesting and romantic but... like, I feel like there's not enough discussion of the fundamental problem of gravity. Like first of all even if we devised a plan to pump insane amounts of methane and carbon dioxide into Mars's atmosphere to try to terraform and warm it up and we managed to melt the ice caps and plant flora and bring fauna and all that... OR we just made little bubbles with local breathable air and everything.... we can never change the actual mass of the planet. And we are fundamentally evolved on a planet of the mass and gravity of Earth. So how would we ever deal with the issue of everyone suffering from early osteoporosis as our bones deteriorate from the lack of gravity? Not to mention other possible medical complications. <br><br>It just seems like maybe... just maybe... instead of trying to terraform an entirely different planet that we're not even physically evolved to exist on.. perhaps we should put that effort into "terraforming" Earth - that is, reversing the effects of anthropogenic global warming/climate change. If terraforming a whole damn planet from scratch is feasible in any way, then reversing the effects climate change is like child's play in comparison.