Correct Answer: C
Explanation:
: (c) Greenhouse effect is warming effect found in green house by allowing solar radiations to pass in but preventing long range heat radiations to pass out. The gases which are transparent to solar radiation but retain and partially reflect back long wave heat radiations are called greenhouse gases.
Recently the concentration of greenhouse gases has started rising resulting in enhanced greenhouse effect that is thus increasing the mean global temperature. It is called global warming. The various greenhouse gases are C02 (warming 60%), CH4 (effect 20%), chloroflourocarbons or CFCs (1.4%) and nitrous oxide (N20, 6%). Others of minor significance are water vapours and ozone.