This does not even pass the laugh test.
Actually, your posts are much funnier. First, "Without [CO2], all plant life on earth would be impossible.", but in your very next post you mock people who believe that "a trace gas at 0.04%" could have any effect.
I'm sorry to say this, but you sound like a poe - "it's so small it's can't possibly have any effect our lives, but for God's sake don't lose it or WE'RE ALL GONNA DIE!" or "She couldn't have killed anyone, she only put a little bit of arsenic in that great big water tower.".
There is an extremely complex non-linear partial differential equation that describes...
Except you don't really need any of that. It's fairly straightforward to calculate (and then check by direct measurement) how much less infrared radiation is being emitted by the earth at various wavelengths. And like any physical system, if less energy is leaving then changes will take place to restore equilibrium - it might be higher temperatures, it might be a higher albedo (as through cloud cover), it might be a reduction in some other heat-trapping gas, it might be people pulling CO2 back out. But something, on a rather large scale, is going to have to change, just because of basic thermodynamics.
So even if I didn't know anything else about the subject you're going to have to give me some alternative for what happens to the excess energy, or I'm stuck with the only answer available to me - climate change.