I'm not an expert, but my impression is that the problem with that is that these green house gasses are going from being long term sequestered to getting into t

I'm not an expert, but my impression is that the problem with that is that these green house gasses are going from being long term sequestered to getting into the carbon cycle. When they get locked into plants, that's a very short term sequestration - when the plants die or are eaten, they decompose and the carbon goes right back into the atmosphere. Basically, plants aren't a great way to lower the average atmospheric CO2 levels. Which begs the question, how do we do long term sequestration? Could we, for example, split CO2 into pure carbon and O2, and then bury the C as graphite (which I believe is not digestible to any organism)?