Which of the following statements regarding carbon dioxide (CO2) and the greenhouse effect is true?

A. all of the answers listed here.
B. CO2 concentration in the atmosphere is relatively low.
C. without CO2, the average global temperature would be below freezing.
D. link between CO2 and the greenhouse effect was proven in the 1800s.
E. global warming from burning fossil fuels was predicted in the 1800s.


Answer: A

Environmental & Atmospheric Sciences

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