Re: The CO2 problem interests me
"Chazmon touched a interesting question up there. I always wondered, how the life support works on habitats, isolated for longer terms, like space stations and nuclear submarines. I mean,"
Submarines typically have a very large power source they can use to desalinate see water, electrolyze it and extract water that way, so O2 and water not big problems on big boats, more trouble on diesel electrics.
Space is more trouble. Despite decades of saying they want to go to the universe NASA still does not have a full closed cycle life support. system. The biggies are urine and sweat. IIRC urine recylc is getting better but the adsorb CO2 onto molecular sieve compounds then expose them to vacuum to boil off. This is in fact an improvement on the old one use filter cartridges.
BTW NASA standard consumables for a 'naut is 5Kg/person/day. maybe 3.5Kg of that is water. So water re-cycyling would (for long missions) save serious amounts of up-mass.
Short answer for space "badly."