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6. What percentage of carbon dioxide is in the atmosphere?

  • 0.038%
  • 0.04%
  • 0.037%
  • 0.039%

7. What is the approximate relative effect of methane?

  • 30
  • 40
  • 25
  • 20

8. What percentage of water vapour is in the atmosphere?

  • 10%
  • variable (up to 4%)
  • 5%
  • 20%

9. What percentage of oxygen is in the atmosphere?

  • 22%
  • 23%
  • 21%
  • 20%

10. What is the approximate relative effect of tropospheric ozone?

  • 25,000
  • 10,000
  • 20,000
  • 30,000

11. What is the approximate relative effect of oxides of nitrogen?

  • 4000
  • 1000
  • 2000
  • 3000

12. What is the approximate relative effect of carbon dioxide?

  • 1
  • 2
  • 10
  • 20