When you add an initial water electrolysis to the sabatier process you can have
H2O + CO2 > O2 + CH4
That is water and carbon dioxide in, oxygen and methane out. Good for life support in space. If you had infinite free energy you can easily synthesize methane out of air and water.
H2O + CO2 > O2 + CH4
That is water and carbon dioxide in, oxygen and methane out. Good for life support in space. If you had infinite free energy you can easily synthesize methane out of air and water.
https://en.m.wikipedia.org/wiki/Sabatier_reaction