Methane, again, is common in the natural world. Yet, shitting in the river still makes the river polluted. Shit also can help make plants grow as fertilizer.
CO2 is absolutely poisonous because it prevents you from getting oxygen.
CO2 is absolutely a pollutant. Nitrogen, which you've already identified helps plants, will also kill you.
My analogy to shit is to point out that something being "natural" doesn't make it not a pollutant. If you don't like "shit" we can go with: uranium (which is naturally occurring and definitely a pollutant), methane (which is also naturally occurring and defini9tely a pollutant), and volcanic ash (which is also naturally occurring and definitely a pollutant)
Methane, again, is common in the natural world. Yet, shitting in the river still makes the river polluted. Shit also can help make plants grow as fertilizer.
It's still a pollution.
CO2 is absolutely poisonous because it prevents you from getting oxygen.
CO2 is absolutely a pollutant. Nitrogen, which you've already identified helps plants, will also kill you.
My analogy to shit is to point out that something being "natural" doesn't make it not a pollutant. If you don't like "shit" we can go with: uranium (which is naturally occurring and definitely a pollutant), methane (which is also naturally occurring and defini9tely a pollutant), and volcanic ash (which is also naturally occurring and definitely a pollutant)