My comment was in reference to your experiment. Just showing that CO2 will absorb infrared energy doesn’t take into account other gasses.

Additionally, reaching the atmosphere is reaching Earth. If the gasses of our atmosphere are heating up, Earth is heating up. No matter which gas or combination of gasses, there is a finite amount of energy that it can hold, otherwise it would turn to plasma. It must reradiate it, some toward the ground some into space, some laterally. It really doens’t matter the energy is now part of our ecosystem. I’m not sure how you disconnect our atmosphere from the ground/oceans. In the atmosphere is on Earth.