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Which set of the following gases is most important for greenhouse effect ?
1) Carbon dioxide, Methane, Chlorine, Nitric oxide.
2) Nitric oxide, Methane, Ethane, Chlorfluoro carbons.
3) Carbon dioxide, Methane, Nitrous oxide, Water vapour.
4) Carbon Monoxide, Sulphur dioxide, Methane, Water vapour
3) Carbon dioxide, Methane, Nitrous oxide, Water vapour.