Hmm, we need more swamps. That\’s it.
You see, those coal beds that we\’re digging up and burning. They were created by trees falling over into swampy ground. Rather than their rotting completely and returning their contained carbon to the atmosphere (or the biosphere in general) they sequestered ther carbon into rock.
So, all we do is spray the forests with water, creating such swamps, and we\’ll sequester all that carbon again.