Thermodynamics and Global Warming

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The second law of thermodynamics tells us that heat flows from hot to cold.

The greenhouse effect has the Sun heating the Earth's surface; the Earth's surface emitting that energy in the form of black-body radiation; CO2 (and other GHGs) absorbing and then re-emitting energy; with some of that energy getting back to the surface re-heating it.

What is not said:

1- CO2 is only sensitive to 8% of what the Earth emits. 92% of what the Earth emits is invisible to CO2

2- The hot-to-cold thing. The Earth should only radiate its energy when it is warmer than the atmosphere. It spends much of the day just absorbing.

3- When the time comes the earth starts emitting 100% of the black-body wavelengths

4- Only 410 ppm of 4% can be said to re-emitted back towards the surface, which is losing 100%

5- This should only occur for several hours until equilibrium is reached


Is that really enough to cause warming?

True, I didn't account for other GHGs, such as water vapor. But I already acknowledge that cloud cover makes for blanket-like coverage. It also prevents the ground from the full brunt of the Sun.