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An increase in carbon dioxide content in the atmosphere would not cause:

A. More heat to be retained by the environment 

B. Increasing in photosynthesis in plants 

C. Global warming 

D. Abundance of desert plants

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CO2 is a greenhouse gas, thus its increase will trap more heat and will cause global warming. Also increased CO2 will increase the rate of photosynthesis however, CO2 increase doesn't contribute towards deserted conditions. Instead, lack of water and increased temperature causes deserted conditions and will promote the growth of desert plants.

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