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Assertion : Contribuition of `CO_(2), CH_(4), CFCs " and " N_(2)O` towards greenhouse effect is respectively 60%, 6 %, 14 % and 20 %. Reason : Greenhouse gases are radioactively active gases which prevent the short wavelength radiations emitted by earth to escape into space.

Answer» Correct Answer - D
The gases which are transparent to solar radiation but retain and partially reflect back long wave heat radiations are called greenhouse gases (GHGs). Greenhouse gases are essential for keeping the earth warm and hospitable. The various greenhouse gases are `CO_(2)` (warming effect 60%) , `CH_(4)` (effect 20%), chlorofluorocarbons or CFCs (14%) and nitrous oxide `(N_(2)O, 6%)`. Others of minor significance are water vapours and ozone.


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