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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%, $CO_2$ 86%
B
Methane 20%, $N_2O$ 18%
C
CFCs 14%, Methane 20%
D
$CO_2$ 40%, CFCs 30%
Detailed Solution
The four main greenhouse gases and their relative contributions to total global warming (as given in NCERT) are:
Carbon dioxide ($CO_2$) - 60 percent
Methane ($CH_4$) - 20 percent
Chlorofluorocarbons (CFCs) - 14 percent
Nitrous oxide ($N_2O$) - 6 percent
Checking the pairs: $CO_2$ is 60 percent (not 86 or 40), $N_2O$ is 6 percent (not 18) and CFCs are 14 percent (not 30).
The only pair in which both values are correct is CFCs 14% and Methane 20%.
Carbon dioxide ($CO_2$) - 60 percent
Methane ($CH_4$) - 20 percent
Chlorofluorocarbons (CFCs) - 14 percent
Nitrous oxide ($N_2O$) - 6 percent
Checking the pairs: $CO_2$ is 60 percent (not 86 or 40), $N_2O$ is 6 percent (not 18) and CFCs are 14 percent (not 30).
The only pair in which both values are correct is CFCs 14% and Methane 20%.