Discussion
Green House Gas (GHG) which is present in the largest concentration in the atmosphere is
Answer: C
The greenhouse gas present in the largest concentration among those listed is carbon dioxide.
Carbon dioxide is present at about 420 parts per million, far more than nitrous oxide (about 0.34 ppm) or the chlorofluorocarbons and hydrofluorocarbons, which are measured in parts per trillion. (Water vapour is more abundant still, but it is not among the options.)
Concentration is different from warming power per molecule: CFCs and HFCs are thousands of times more potent than CO2 but present in tiny amounts.
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