Which one of the following greenhouse gases is man-made?

[amp_mcq option1=”Carbon dioxide” option2=”Chlorofluorocarbon” option3=”Methane” option4=”Nitrous oxide” correct=”option2″]

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UPSC Geoscientist – 2022

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Chlorofluorocarbons (CFCs) are entirely synthetic, man-made chemicals. They do not have significant natural sources and were developed for various industrial applications such as refrigerants, aerosols, and cleaning solvents. They are potent greenhouse gases.

Greenhouse gases trap heat in the Earth’s atmosphere, contributing to the greenhouse effect. While carbon dioxide, methane, and nitrous oxide are naturally occurring gases, their atmospheric concentrations have been significantly increased by human activities (anthropogenic emissions). In contrast, CFCs are purely anthropogenic compounds.

CFCs were widely used but are now largely phased out under international agreements (like the Montreal Protocol) because they also contribute to the depletion of the stratospheric ozone layer, in addition to being powerful greenhouse gases. Other exclusively man-made greenhouse gases include Hydrofluorocarbons (HFCs), Perfluorocarbons (PFCs), and Sulphur Hexafluoride (SF₆).

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