Which of the following is caused by an increase in ${C O}_{2}$ concentration in the atmosphere?

Global warming

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Eutrophication of lakes

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Depletion of the ozone layer

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Magnification in the food chain

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Acid rain

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Solution

The correct option is B Global warming
Global warming is caused by increased concentration of greenhouse gases (carbon dioxide is one of the greenhouse gas) in the atmosphere. Increased organic matter in lakes causes eutrophication. Ozone depletion is mainly related to the use of CFC-based products. Acid rain is the result of increased sulphur and nitrogen oxide levels in the atmosphere. Increased use of pesticides causing the death of predators will cause accumulation of nonbiodegradable compounds in the food chain. Thus, the correct answer is option A.

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