All CO2 molecules in the atmosphere are warmed to local air temperature by collision induced conduction to above this temperature. (theinconvenientskeptic.com)
When this water condenses this latert heat is given up so if this happens near the surface then local air temperatures will increase slightly. (wattsupwiththat.com)
It seems that CO2 can absorb all it meets (within its limited spectra) but can not emit much because local air temperatures are far, far too low for the CO2 molecule to reach the required kinetic energy level to emit a photon. (theinconvenientskeptic.com)