dear collegues, I am a farmer producing tomatoes in green house, so this discussion is veryy interesting, because if we can separate the co2 from the rest, we can reuse as fertilizer in form of gas, (and that means 30% more yield if the rest of the conditions are right), and the metane gas for engine energy.
so you manage to find a cheap solution, we can produce food high tech in remote areas with biogas, solar and conventional energy.
co2 is a valuable gas for us in green house production, metane and niox NO.
co2 we need day time with light