Any time you have a flow of energy into a system and a delay of energy exiting that system, you have an accumulation of energy occurring within that system. {/auote]
How long do you suppose a "packet" of IR takes to pass through a CO2 molecule if it is travelling at, or near the speed of light? What kind of delay are we talking about?
That accumulation of energy in the Earth system is expressed as a heating of the elements within that system.
You are operating heavily on assumption and very lightly on fact. If IR radiates from the surface of the earth at, or near the speed of light and some small bit of that IR interacts once with a CO2 molecule by passing through and then on out of the atmosphere, how much delay and how much delay and accumulation do you believe is happening.
Your idea, in order to be of a magnituded that would have any effect at all assumes that IR must be bouncing from CO2 molecule to CO2 molecule effecting an actual delay but alas, that doesn't, can't happen. IR exits a CO2 molecule at a slightly lower energy state or slightly longer wavelength than it was when it entered. Some small bit of energy was used causing the vibration a CO2 molecule experiences when IR passes through and as a result, slightly less energy is exiting (longer wavelength). And due to the very narrow absorption band of CO2, molecules simply can't absorb the emission of other like CO2 molecules.
It is that sort of assumption that has made a pseudoscience out of climate science. Models are built upon flawed and sometimes outright wrong assumptions and the output of those models is accepted as fact which is then incorporated into the work of other climate scientists as if it were true. You genuinely believe that CO2 can delay the escape of IR from the atmosphere when it simply does not happen.
Here is a link from the eia discussing the topic:
Renewable & Alternative Fuels - Analysis & Projections - U.S. Energy Information Administration (EIA)
Clip:
What happens after the GHG molecules absorb infrared radiation? The hot molecules release their energy, usually at lower energy (longer wavelength) radiation than the energy previously absorbed. The molecules cannot absorb energy emitted by other molecules of their own kind.
And here is a formal explanation:
Jennifer Marohasy » Recycling of Heat in the Atmosphere is Impossible: A Note from Nasif S. Nahle