Slide 4 in this series.
Once the earth heats up, the energy must be released in one of three forms: evaporation being the dominate one followed by IR radiation and then conduction/convection.
The outgoing spectrum at high altitude presents us with another swiss cheese energy diagram. Water Vapor dominates here as well.
Curves as reference SBP curves, a form of curves that comes from quantum mechanics. The window to the OS is shown is much more than the 6%.
I compute over 30%. With the CO2, O3, and Water vapor taking away some of the energy in reducing the amplitude of the SBP curve as emitted from the earth's surface.
NEXT: Looking deeper into the absorption in the atmosphere, we can gain a better understanding of the radiation component. But do not forget that it is not the dominant energy release mechanism.
The links below are to the pages or slides in this section, which covers the science of CO2.