Comment by henearkr

It is not weird at all.

A completely useful (and consistent with the modern usage of the word) definition of "pollution" can be worded as:

"anthropogenic alteration of the open environment with negative consequences on ecosystems or society".

Have you heard about noise pollution? Match it with the definition above.

CO2 emitted by combustion from human activities is orders of magnitude more than what any natural biological process emits.

Now you can see why CO2 emitted by fossil fuels combustion is, by any logic, pollution.