Any argument that attempts to build further upon the fact that CO2 is around 0.04% as being at all significant compared to OTHER %’s of gases in the atmosphere is a failure.
It doesn’t matter what % it is compared to other gases in the atmosphere because there are effects of the % of carbon in the atmosphere that stand alone.
Ignore the function of carbon in the atmosphere and its relation to the temperature of the planet and one gets led down the garden path instead.