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Which statement is correct regarding greenhouse gases? 

I. A greenhouse gas (GHG) is a gas in an atmosphere that absorbs and emits radiation within the thermal infrared range 

II. Water vapour contributes to 36-72% of Greenhouse effect 

III. Nitrous Oxide contributes to about 10% of Greenhouse effect 

IV. Ozone contributes to 3-7% of Greenhouse effect 

(a) I & II (b) I, II & III (c) I, II & IV (d) All the above

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1 Answers

(c) Nitrous Oxide (NO2) (5%) arises from coal burning, biomass burning, and breakdown of chemical fertilizers.

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