The only point is that more greenhouse gases, means more greenhouse effect of infrared radiation coming back down from the atmosphere.
Kind of the definition of greenhouse gases.. I tend to consider them a thermal mass. After absorbing the energy in the bands corresponding to chemical bonds, they re-radiate as blackbodies in all directions.. including back down. Some of that re-radiation (if it is re-radiated in the same wavelength that the gas absorbs in, gets reabsorbed and then yet again re-re-radiated (making the whole process a potential nightmare to project/simulate)). Most of greenhouse gas re-radiation will not be in the exact same band that it was absorbed in (property of blackbody radiation), since the blackbody radiation frequency is temperature driven, and not all atoms within a sample of gas at a specific temperature will have exact same thermal energy.(shouldn’t need to reference this last sentence since it is beginning college chemistry).
