Comment on Congressional Climate Briefing to Push “End of Climate Change Skepticism” by gbaikie

“But briefly, backradiation from atmosphere to surface is less than radiation from surface to atmosphere.”
Ok
“Backradiation exists, it is radiation from the cooler atmosphere to the warmer surface, it’s been directly measured now for over forty years, and there’s no violation of any thermodynamics because the heat flow, obtained by summing all the energy flows, remains upwards.”
Ok
Galactic background radiation was detected from earth.
But it’s not warming earth.
It’s 2.725 K. If instead it was 5 K or 1 K it wouldn’t cause the earth to get warmer or cooler.
It will prevent any object in space from passively cooling below 2.725 K. It could do work or heat could flow from it if a object if object were cooler than 2.725 K.
If the surface is cooler than the sky then the sky can warm the surface- it do work, there would a heat flow from sky to the ground. It would warm this cooler ground.
If the sky were 1000 C and the ground was 1000 C, the sky would not warm the ground- the sky heat could not do any work if there no cooler temperature than 1000 C