Both :) It is somewhat funny but might actually work. Plants are great at absorbing CO2, but that is very transient in the nature. One certainly could burry who

Both :) It is somewhat funny but might actually work. Plants are great at absorbing CO2, but that is very transient in the nature. One certainly could burry whole logs underground and perhaps it is possible to prevent decay from releasing the captured carbon again as CO2. Charcoal is pure carbon and less likely to decay and much easier to store. And we have the production facilities for that. One would of course have to compare the several competing mechanisms which actually works best.