Agreed; it's a good way to visualize just how much time was required for the biosphere to produce those fossil fuels but not how much energy would be required t

Agreed; it's a good way to visualize just how much time was required for the biosphere to produce those fossil fuels but not how much energy would be required to scrub the carbon itself (and I didn't say that, although my statement was a bit misleading - edited). I still think my point stands - scrubbing it from the atmosphere would involve an amount of energy that is unrealistic without deep, deep changes in our society.