I hope to make it more clear here the relevance of the climate alarm pseudoscience radiative greenhouse fraud in the light of the physical concept of energy flux density.
Recall this diagram of the mechanism of the radiative greenhouse effect, from the University of Washington Department of Atmospheric Sciences:
Keep in mind that the reasoning of this diagram and the others like it form the basis of greenie environmentalist anti-human & anti-social climate alarm and pretty much all of climate science.
What they do in the top left corner is divide the input flux from Sunlight such as to spread it over the entire Earth surface at once. This is where the divisor of 4 comes from because a cross-section interception disk of light from the Sun has ¼ the surface area as a globe Earth with the same radius.
Is this a physically valid procedure? Mathematically you can do it, and you can call it an average, and you can say it conserves total energy and everything…but does it make physical sense? Does it reflect actual physics as reality actually “computes” and performs itself?
If the answer isn’t obvious to you yet, then consider this: Does a stove temperature equivalent to 2000 W/m^2 of radiation which equals 320 degrees Fahrenheit have the same effect on matter as 2000/4 = 500 W/m^2 which equals 91 degrees Fahrenheit, but applied 4-times longer?
Think of cooking a turkey if it helps. Or invert the example: can you use 4-times the energy (with its equivalent transform to temperature via the Stefan-Boltzmann Law) but applied in ¼ of the time to get the same end result?