It doesn't make a difference to the amount of energy required. The scale of the problem is the integral of all human energy consumption over all time. We need

It doesn't make a difference to the amount of energy required. The scale of the problem is the integral of all human energy consumption over all time. We need to reverse it, and the reverse process will require much more energy than was released by the forward process, and we need to do in a few years what was done over 200 years. Whether we put it into the ground or into carbon ingots is immaterial.