Multiple choice

The percentage of carbon dioxide in the atmosphere is

  1. 0.03 to 0.04%

  2. 21%

  3. 2.45%

  4. 7.8%
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A Correct answer
Explanation

The percentage of carbon dioxide in the atmosphere is .03% .04%. In 2009, the CO2 global average concentration in Earth's atmosphere was about 0.0387% by volume, or 387 parts per million by volume. 

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