If there were no CO2 in the earth's atmosphere, the temperature of earth's surface would have been:
Correct answer: C. Less than the present
- A. same as present
- B. Higher than the present
- C. Less than the present
- D. Dependent on the amount of O2 in the atmosphere
Explanation
Without atmospheric CO2, the greenhouse effect would be greatly weakened, so Earth's average surface temperature would be lower than it is now. CO2 absorbs outgoing infrared radiation and helps retain heat.
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