Carbon, like water exists in a fixed amount on this planet. It is never a question of how much or how little. It is a question of where is it. Make more babies. Plant more trees, etc. We have underground sequestration: Coal, limestone, peat, diamonds. This is what nature does. Carbon is the result of the celestial smelter; the super nova. Being somewhat light weight it is found in quantity in the crust. Life is another way of nature gathering carbon into a specific locale. Support LIFE!