CO2 sequestration, the last best hope of the carbon lobby, has been touted as a way that we can keep burning oil and coal, but bury the CO2 underground so we never have to worry about it ever again, just like Love Canal.
Actually, Love Canal may be a good analogy for sequestration: It looks like injecting CO2 into deep geological formations causes some nasty changes in ground water, potentially fouling drinking water.
We keep trying to find anything short of actually not emitting CO2 and we keep finding that, no, there really isn't any substitute for just not burning the stuff in the first place. Not planting trees (which we should be doing anyway), not giant space mirrors, not burying the stuff.
Just stop. It's that simple.