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Gases commonly referred to as 'green house gases' are:

[A].	CH4, N2, CO2 and NH3	[B].	CO2, O2, NO2 and NH3
[C].	Chloro-fluoro-carbons, CO2, NH3 and N2	[D].	CO2, chloro-fluoro-carbons, CH4 and NO2

Answer: Option D