Which one of the following is the correct percentage of the two (out of the total of $4$) greenhouse gases that contribute to the total global warming?
- A$N_2O\ 6\%, CO_2\ 60\%$
- BMethane $20\%, N_2O\ 18\%$
- C$CFCs\ 14\%$,Methane $20\%$
- D$CO_2\ 40\%, CFCs\ 30\%$
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