Question

Carbon dioxide is necessary for plants. Justify this statement. Why do we consider it as a pollutant.

Answer 1

It is considered as a pollutant becausecarbon dioxide is a green house gas and its excessive amount in the atmosphere results in global warming. ... Besides that, higher concentration of carbon dioxide may also cause suffocation, hard breathing and choking problems in humans
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Answer 2

it is it is true that carbon dioxide is necessary for plants as they need it to synthesise carbohydrates during photosynthesis but excessive amount of Co2 in atmosphere becomes harmful for living organism and hence it is considered as pollutant.

Excess of excess of Co2 in atmosphere is causing global warming by forming an annual up around the earth which prevent heat from the Earth surface to escape into the atmosphere.