Living creatures who travel upon our most wonderful planet eat foods they consider delicacies, breathe air to acquire Oxygen, then exhale to provide Carbon Dioxide to the atmosphere.
Living things which are essentially stationary with roots into the soil, in turn "eat" the Carbon Dioxide in order to convert it into cellulose, lignin, sugars and other substances and chemicals which are beneficial to the aforementioned "travelers" as either materials useful in commerce or as foods.
A well thought out plan by those who made all life possible. Therefore, Carbon Dioxide is not a pollutant but a plant food. Unless, of course, those who make "rules of men" wish to classify it as a pollutant in order to serve some political purpose.
Farmers know better. Without abundant Carbon Dioxide there are no crops.