So the sea level changes involved with the last ice age were around 400 feet, and we'd probably need a similar change in sea level to see a similar impact on un

So the sea level changes involved with the last ice age were around 400 feet, and we'd probably need a similar change in sea level to see a similar impact on undersea volcanoes right now. The smaller hiccup with that rescue plan is that we don't really want to see sea levels go up 100+ feet; even if that "fixes" global warming, that was one of the consequences of global warming we were trying to avoid. The larger hiccup is that the undersea volcanoes may not be contributing enough CO2 that even if they stopped completely it may not have a significant impact on our trajectory, and even if they were a large enough contributor, we may not have enough ice left to raise the sea levels enough to significantly affect their output.