The percentage of CO2 in the atmosphere is:
Correct answer: B. 0.042%
- A. 0.0042%
- B. 0.042%
- C. 4.2%
- D. 42%
Explanation
The concentration of carbon dioxide in the Earth's atmosphere is a small but significant fraction. As of the early 2020s, the concentration is over 400 parts per million (ppm), which is equivalent to approximately 0.042%.
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