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
    $N_2O\ 6\%, CO_2\ 60\%$
  • B
    Methane $20\%, N_2O\ 18\%$
  • C
    $CFCs\ 14\%$,Methane $20\%$
  • D
    $CO_2\ 40\%, CFCs\ 30\%$

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