Reversed as in slowed down, absolutely. Reversed as in CO2 levels brought back to preindustrial levels within a few lifetimes, not known. The "warming" is a s

Reversed as in slowed down, absolutely. Reversed as in CO2 levels brought back to preindustrial levels within a few lifetimes, not known. The "warming" is a small part of the overall problem; CO2 increases are impacting a far wider range of conditions, including those in your own body, and that of your food. The temperature changes just capture the imagination better. Other than stopping burning so darn much, our two go-to strategies are "artificial weathering" where we unearth carbonaceous rock and convert CO2 into bicarbonate, pulling it out of the cycle, and "ocean fertilization", where we unleash the power of aquaculture by dumping mineral nutrients into large swaths of ocean, whereby a new crop of plant critters will absorb the CO2 and add it to the food chain. Most other ideas either make the problem worse (blocking out part of the sun, for instance), or fail to move the needle. My upcoming book Fat Gas (first few chapters at fatgas.com) is a useful resource on the subject.