We already have a cheap, plentiful, 100% natural, and green way to do this: plants. Having a dozen plants in every room would go a long way towards fixing the O

We already have a cheap, plentiful, 100% natural, and green way to do this: plants. Having a dozen plants in every room would go a long way towards fixing the O2/CO2 balance, though the biochemistry and physics may not work out to get us back to square one.