GHGs are beneficial for the human existence as without it the earth would have been cooler and far t...........

Environment and Ecology Sustainable Development

GHGs are beneficial for the human existence as without it the earth would have been cooler, and far too cold for life to exist. But few GHGs are generated only through anthropogenic activities such as

1. Methane

2. Nitrous oxide

3. Sulfur hexafluoride

4. Hydro-fluorocarbons

Select the correct answer using codes given below

2, 3 and 4 Only

1, 2 and 3 Only

3 and 4 Only

1 and 4 Only

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Explanation:

Sulfur hexafluoride (SF6) is an inorganic, colourless, odorless, non-flammable, extremely potent greenhouse gas, which is an excellent electrical insulator.
Perfluorocarbons (PFCs) are man-made compounds containing just fluorine and carbon. They are generally colourless, odourless non-flammable gases at environmental temperatures and for the most part chemically un-reactive.Methane and Nitrous oxide are naturally occurring Green House Gases.
Sulphur hexafluoride (SF6) is a gas whose molecules consist of one sulphur atom and six fluorine atoms. It is colourless, odourless, non-toxic, and non-flammable, and is soluble in water and some other liquids. According to the Intergovernmental Panel on Climate Change, SF6 is the most potent greenhouse gas.
Hydro fluorocarbons (HFCs) are man-made greenhouse gases used in air conditioning, refrigeration, solvents, foam blowing agents, and aerosols.