As an example, I was running out some of
calcs the other day and at the temperature I was using, only 1 in 800 CO2s had the
energy necessary to shoot off a photon (and consequently, one N2 in 800 also had that
energy), but that was exactly enough to balance the absorption I was dealing with.
I wish I could find the posting here where I went through the back - of - envelope
energy flux
calcs (justifying why I am a lukewarmer either to RKS or Dung) and came up with a climate sensitivity not a million miles away from this figure:)