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Carbon dioxide in air is essential as plants use it to make food. When does it become a pollutant?

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When there is excess of carbon dioxide in the air, and lack of trees or plants for consuming it in photosynthesis process then it acts as pollutant. Carbon dioxide is being increased continuously in atmosphere due to deforestation, burning of fossil fuels, industrialization, use of petrol and diesel in automobiles.

As a pollutant now carbon dioxide contributes to greenhouse effect and global warming.

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