Yeah, sure, but the point is that it would only get you a third of the way to the goal of removing all man-made CO2 from the atmosphere (and oceans) rather than

Yeah, sure, but the point is that it would only get you a third of the way to the goal of removing all man-made CO2 from the atmosphere (and oceans) rather than two thirds as was claimed. And the atmosphere is sort-of especially important because that's where the warming happens, CO2 in the oceans does not directly contribute to the greenhouse effect. Though it does cause acidification, which isn't exactly helpful either.