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Which one of the following is the correct percentage of the two (out of the total of 4) green house gases that contribute to the total global warming?

1. CFCs 14%, Methane 20%
2. CO2 40%, CFCs 30%
3. N2O 6%, CO2 86%
4. Methane 20%, N2O 18%

Correct answer: Methane 20%, N2O 18%

Solution

Methane and nitrous oxide are commonly cited as contributing about 20% and 18% respectively to total global warming among the major greenhouse gases. The other options either include incorrect gases or unrealistic percentage splits.

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