Belgian Waffle - the magical properties of CO2

In real life on Earth, the physical layer which absorbs most radiation from the Sun and which also emits most radiation to space is the clouds. So the clouds have to reach a certain temperature dictated by SB-Law, and their actual temperature is higher than that because clouds have significantly less than 100% emissivity. Not uncoincidentally, typical average cloud altitude = effective emitting altitude of 5km (link to article with a classic 'let's ignore clouds and pretend that it's CO2 at work' explanation). 

Clouds have to warm up the surrounding air to the same temperature. In turn, the ...