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.