Our atmosphere consists of__________ CO2?

  • A. 0.03 to 0.04% CO2
  • B. 0.3 to 0.4% CO2
  • C. 3 to 4% CO2
  • D. None of these

Explanation

Carbon dioxide forms roughly 0.04% of the atmosphere today, commonly stated in older texts as 0.03 to 0.04%. The other ranges are far too high for atmospheric CO₂.

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