There are three new heat sources, green house gas is one, missing sea ice is a second, land modification is the third. 20 million square miles of farmland on a world with 190 million square miles surface area, combined with all the irrigation that involves,and all the reduced reflectance, is a significant heat load. Reducing emissions is very important to give us time for a technical solution. Reducing emissions will only address one of our three new heat sources. Even if the greenhouse effect is 100% responsible for melting the 3 million square miles of ice we are currently missing, that missing ice is still a heat load in and of itself. We are most likely already in a runaway warming event, we need a technical solution. We need to learn how to thicken sea ice by putting the right amount of water on top of it at the right time.