The important
point in this statistical law is that if we add some
energy to a great number of molecules, this
energy will be shared equally among their translational, rotational and
vibrational degrees of freedom.
My main
point is that my substantial physics training leads me to believe that the main impact of GHGs is
vibrational excitation followed by return to the ground state, emitting a photon of the same wavelength but in a random direction, rather than by any significant transfer of internal
vibrational energy to thermal
energy of surrounding molecules.