Which one of the following options correctly designate the per cent contribution of gases (A, B, C and D) responsible of global warming? A B C D (1) CH_4(20%) CFCs(14%) N_2O(6%) CO_2(60%) (2) CFCs(20%) CO_2(14%) N_2O(6%) CH_4(60%) (3) N_2O(20%) CH_4(14%) CFCs(6%) CO_2(60%) (4) CH_4(20%) N_2O(20%) CFCs(6%) CO_2(60%)

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