Question

carbon dioxide is necessary for plants. why do we then consider it as a pollutant?

Answer 1

Because it is in much quantity than required. By Excessive use of fossil fuels etc

Answer 2

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It is considered as a pollutant because carbon dioxide is a green house gas and its excessive amount in the atmosphere results in global warming. It increases the overall temperature of the earth, resulting in changes in the earth’s climate. During the last century, the temperature of earth has increased by 0.6ºC. This increase in temperature is ultimately believed to cause the  melting of polar ice caps, rise in the sea level, and submerging of the coastal areas.

Besides that, higher concentration of carbon dioxide may also cause suffocation, hard breathing and choking problems in humans. 


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