Which one of the following is the correct percentage of the two (out of the total of 4) green-house gases that contribute to the total global warming?

Step-by-step solution

The gases, which are transparent to solar radiation but retain and partially reflect back long wave heat radiations are called green-house gases. Recently, the concentration of green-house gases has started rising resulting in enhanced green-house effect that is resulting in increase the mean global temperature. It is called global warming. The various green house gases are CO ₂ (warming effect 60 %), CH ₄(20 %) , CFCs (14 %) and nitrous oxide- N ₂ O (6 %) .