I sometimes think of it as a fry pan, there is a lot of heat coming from underneath (254 kelvin), and then the heat coming from the sun as a hair dryer blowing into it. if you put a lid on, the temperature goes up. but CO2 and other greenhouse gases arent really a lid, cause there is room for expansion, so they are more like mesh splatter screens. they will absorb some heat and trap some heat. the