In the 1990 IPCC report it talks about “greenhouse gasses” and also about “air pollution” but treats those as two distinct things: https://www.ipcc.ch/site/assets/uploads/2018/05/ipcc_90_92_a.... For example, on page 97, it says “CO2 enrichment” may “enhance plant growth,” but that “enhanced levels of air pollution could also reduce this positive effect.” There’s it’s clearly talking about CO2 and air pollution as two different things that have opposite effects on plant growth.
Is the IPCC also “morons?”