Here’s an intriguing statement:

CO2 is not a “pollutant”; it is plant food.
It is also the inevitable emission generated by every living animal on Earth. It thus cannot be a “pollutant.”

Fun fact: about a bazillion years ago, life on Earth primarily consisted of animals that excreted O₂. They were wildly successful, and so — because no organism can survive in an environment of its own waste — died out in a great extinction event sometimes called the Oxygen Catastrophe.

Pollutants can be useful; that doesn’t stop them being pollutants.