Slide 25 in this series.
The science of radiation from a random surface at a temperature is well understood. What is in question is the determination of the GHE as previously covered. The curve coming from the earlh is a Planck shaped curve radiating from a temperature of 288K.
NEXT: The physics of IR absorption is next.
These links are the topics for this section.
Modelling Temp Natural Factors
Earth and the Science of Radiation
Milankovith Overlapping Cycles