Iulus Cofield wrote:I was more thinking there is some possibility of finding a way to harvest that oxygen, whereas a moon colony would have to permanently rely on imports and recycling.
Yeah, I figured. I am not sure that it would be feasible, given the atmospheric difference though.
That said, the water and probably iron oxides on mars could probably be turned into delicious oxygen, so yeah. I wouldn't look to the atmosphere for it since it's everywhere else (though, as pointed out, there's more than enough CO2 to actually do fun stuff.)