An increase in CO_2 content in the atmosphere | vedclass

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(C) An increase in $CO_2$ levels leads to the greenhouse effect,which causes more heat to be retained by the environment and contributes to global war

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Abundance of desert plants

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(C) An increase in $CO_2$ levels leads to the greenhouse effect,which causes more heat to be retained by the environment and contributes to global warming. Increased $CO_2$ can also enhance the rate of photosynthesis in many plants. However,the abundance of desert plants is primarily limited by the scarcity of water,not by the concentration of $CO_2$. Even with higher $CO_2$ levels,desert plants cannot thrive without sufficient water,which is a limiting factor in arid ecosystems.

An increase in $CO_2$ content in the atmosphere would not cause:

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