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Which of the Following Describes the Concentration of CO2 in the Lower

Question 35

Multiple Choice

Which of the following describes the concentration of CO2 in the lower atmosphere?


A) It is 30 percent higher than it was 300 years ago.
B) It has stabilized.
C) It is not related to the amount of forest cover on Earth.
D) The present average measurement is 150 ppm.

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