Yes, co2 is a pollutant.
How on earth you come to the conclusion that co2 being a pollutant is in opposition to co2 being a fundamental natural resource is quite frankly beyond me. It's both, and which term you use depends on the context.
Just like it is with every other pollutant out there. Again, I point to the possibility that you do not understand what a pollutant is as the most reasonable explanation.
EDIT: Barring the possibility of some whacko religious schools in hillbillystan, photosynthesis is taught to all school children. Calling co2 a pollutant while teaching photosynthesis is absurd. Photosynthesis is also one of the first chemical reactions a pupil is exposed to, way before co2 is discussed as a pollutant.
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