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CO2 is demonstrably emitted as a pollutant, but it's only a fertilizer in pretty poetic sense: Plant growth is bottlenecked by other factors.
Funny that people who say things like this and “CO2 is only 0.04% of the air” don’t want to try injecting 0.04% of their blood volume of hydrogen cyanide and seeing if such a tiny amount of something can have an effect…
Care to take a big huff off a farmer's anhydrous ammonia tank?