IPCC first report was 1990, and the basic arithmetic of the atmosphere goes even further back.

Right, but the 1990 IPCC report doesn’t use the term “pollution” to refer to CO2: https://www.ipcc.ch/site/assets/uploads/2018/05/ipcc_90_92_a...

It uses the term “greenhouse gas” to refer to CO2 and uses the term “air pollution” to refer to what people traditionally think of as air pollution. For example, in one place of says: “Consequences of CO2 enrichment and climate change for natural terrestrial ecosystems could be modified by other environmental factors, both natural and man induced (e.g., by air pollution).” So that’s treating “CO2 enrichment” (emissions) as distinct from “air pollution.”

I was battling global warming in Civ endgames in 1991...