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The two gases making highest relative contribution to the greenhouse gases are
A
$CO_2$ and $N_2O$
B
$CO_2$ and $CH_4$
C
$CH_4$ and $N_2O$
D
CFCs and $N_2O$
Detailed Solution
Relative contribution of the greenhouse gases to total global warming: $CO_2$ 60%, $CH_4$ 20%, CFCs 14% and $N_2O$ 6%.
The two largest contributors are carbon dioxide (60%) and methane (20%).
Hence the two gases are $CO_2$ and $CH_4$.
The two largest contributors are carbon dioxide (60%) and methane (20%).
Hence the two gases are $CO_2$ and $CH_4$.