Arrange CFC, CH${}_4$, N${}_2$O and CO${}_2$ in decreasing order according to their contribution in green house effect.

The correct option is D CO${}_2$ > CH${}_4$ > CFC > N${}_2$O
Global warming potential (GWP) is a measure of how much heat a greenhouse gas traps in the atmosphere up to a specific time horizon, relative to carbon dioxide. The major contribution is from CO${}_2$​ (60%), CH${}_4$​ (20%), CFC and N${}_2$​O attributes to 14% and 6% respectively. Hence, correct order is
CO${}_2$ > CH${}_4$ > CFC > N${}_2$O.