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?

Question: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.CO2 40%,CFCs 30%

2.CFCs 14%, Methane 20%

3.Methane 20%, N2O 18%

4.N2O 6%, CO2 86%


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