It was in the comment section of a very informative interview with William Happer about climate change.
"Joseph E Postma says
January 10, 2017 at 10:12 pm
There is in fact no radiative greenhouse effect at all. Climate science is so far off the mark that it is founded upon a concept which doesn’t even exist."
This was my answer to Joseph Postmas comment:
This argumentation does much harm to the skeptics issue. The simple fact is that nearly all matter above 0 Kelvin is radiating energy in form of infrared radiation, including CO2, water vapor and methane, which are members of the atmospheric gasses.
If theses gasses are radiating in all directions, whichever temperature above 0 K they have, a certain amount will go back to the earth's surface. Thereby they will slow the net transfer of heat from the surface to the space.
One common misconception is that " due to the laws of thermodynamic colder materials cannot heat up warmer materials, therefore colder CO2 cannot heat up the surface" - which in turn would insist that no colder item is allowed to send infrared radiation towards a warmer item.
The reality is: If a certain colder surface radiates 40 w/m² towards a warmer surface which radiates 100 w/m², the net flow is 60 w/m² towards the colder surface. This is exactly how thermodynamics work.
Just think about these gold or aluminium plated emergency blankets. If you wrap one around yourself in a cold surrounding you are getting warmer. The blanket is colder than you, but it radiates back some amount of heat towards your warmer body.
For a more elaborate explanation how radiation is working, just read at my blog:
For easy access here my example from that post: