There is an (unfounded) debate as to whether CO2 should be called pollution. The common mistake many people make is that pollution must be damaging to human health in order for it to be called pollution.
This of course is incorrect, although skeptics throw out knowledge and go with the common belief as outlined above when they say CO2 is not a pollutant. The meaning of the word pollutant changes as culture changes, so today we have light pollution and noise pollution. Three hundred years ago we didn't have these problems or didn't really bother to much about them.
Today light pollution stops us seeing all the stars and noise pollution interferes with birds living patterns. CO2 is a new pollution problem, its become a problem because it has an impact on our climate and oceans, that in turn has an impact on us and the planet.
So by definition CO2 is a pollutant. We shouldn't be afraid of calling it that, but we should be afraid of the consequences of not controlling how much we emit.
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