Which of the following gases is involved in global warming?(I) CO2                   (II) H2O (Vapour)                    (III) N2                    (IV) O3(V) Chlorofluorocarbons

75% of solar energy reaching the earth is observed by the earths surface. Rest energy is radiated into the atmosphere which is absorbed by CO2, H2O (vapour), CH4, CFCs etc., gases to heat up the atmosphere and cause global warming.