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Which one of the following pairs of gases are the major cause of \"Greenhouse Effect\""?"
A
$CO_2$ and $N_2O$
B
$CO_2$ and $O_3$
C
$CO_2$ and CO
D
CFCs and $SO_2$
Detailed Solution
Greenhouse gases absorb the long-wave (infra-red) radiation emitted by the earth and so warm the atmosphere.
The relative contributions of the greenhouse gases to total global warming are: $CO_2$ 60%, $CH_4$ 20%, CFCs 14% and $N_2O$ 6%.
So $CO_2$ and $N_2O$ are both recognised greenhouse gases.
CO and $SO_2$ are air pollutants but are not listed among the greenhouse gases, and ozone is not one of the four major contributors.
Among the given pairs, the one in which both gases are major greenhouse gases is $CO_2$ and $N_2O$.
The relative contributions of the greenhouse gases to total global warming are: $CO_2$ 60%, $CH_4$ 20%, CFCs 14% and $N_2O$ 6%.
So $CO_2$ and $N_2O$ are both recognised greenhouse gases.
CO and $SO_2$ are air pollutants but are not listed among the greenhouse gases, and ozone is not one of the four major contributors.
Among the given pairs, the one in which both gases are major greenhouse gases is $CO_2$ and $N_2O$.