You are doing a poor job of fisking Samwik. The way we tell the globe is warming is by taking the temperature of the air. In the Wood experiment, he used air as the medium. One of the boxes was encased in a material that blocked IR radiation. The other was encased in a material that permitted IR radiation to pass through to do what it could to the water vapour, CO2, methane, ozone, etc. that was in the box. There was virtually no difference in the temperature of the two boxes, so the answer to your "Not even CO2" question is Yes. Not even CO2 nor the more powerful water vapour that existed in the air changed the temperature of the polished rock salt box.
The rest of your post is about strawman arguments like your "[a]re there any chemists or physicists who think CO2 doesn't absorb IR as the spectra show" question. I am not saying that the IR is not absorbed. You are confusing the two arguments.
