being extremely generous, and assuming he meant "martian atmosphere" when he said "air", it _might_ be a bit more challenging (depending on your process and wha

being extremely generous, and assuming he meant "martian atmosphere" when he said "air", it _might_ be a bit more challenging (depending on your process and what you've got available) to convert the CO2 at 0.095 PSI into O2, than it would be to pull the CO2 out of ~14.7 PSI human exhalations and convert it to O2. seems like the kind of thing where there is a bunch of engineering that could be productively done.