Mr E you keep posting that but it's either semantics or just plain incorrect depending on the definition of the word you choose.
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pollutant
pol⋅lu⋅tant
/pəˈlutnt/ Show Spelled Pronunciation [puh-loot-nt] Show IPA
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–noun
1. something that pollutes.
2. any substance, as certain chemicals or waste products, that renders the air, soil, water, or other natural resource harmful or unsuitable for a specific purpose.
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It's maybe not a perfect way to describe it but an increase in CO2 renders our atmosphere harmful so can be described as a pollutant.