Question
$\text{CO}_2$ is inert and harmless gas, yet it is thought to be a serious pollutant. Explain.
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Answer
$\text{CO}_2$ absorbs infrared radiations from atmosphere which lead to global warming. If $\text{CO}_2$ level increases beyond 0.03%, the natural greenhouse balance may get disturbed. $\text{CO}_2$ is a major contributor to global warming, therefore, it is considered as serious pollutant.
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