So the sea level changes involved with the last ice age were around 400 feet, and we&#x27;d probably need a similar change in sea level to see a similar impact on undersea volcanoes right now.<p>The smaller hiccup with that rescue plan is that we don&#x27;t really want to see sea levels go up 100+ feet; even if that &quot;fixes&quot; global warming, that was one of the consequences of global warming we were trying to avoid.<p>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.