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Among the following air pollutants, identify the ones responsible for the greenhouse effect.

1. Carbon dioxide

2. Methane

3. Sulphur dioxide

4. Chlorofluorocarbons

5. Carbon monoxide


1. 3,, 4, 5
2. 1, 2, 4
3. 1, 2, 3, 5
4. 1, 2, 3, 4, 5

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Correct Answer - Option 2 : 1, 2, 4

Green House Gases:

Gases that trap heat in the atmosphere are called greenhouse gases. Major Greenhouse Gases are:

1. Carbon Dioxide: Carbon dioxide enters the atmosphere through burning fossil fuels (coal, natural gas, and oil), solid waste, trees and wood products, and also as a result of certain chemical reactions (e.g., manufacture of cement). Carbon dioxide is removed from the atmosphere (or "sequestered") when it is absorbed by plants as part of the biological carbon cycle.

2. Methane: Methane is emitted during the production and transport of coal, natural gas, and oil. Methane emissions also result from livestock and other agricultural practices and by the decay of organic waste in municipal solid waste landfills.

3. Nitrous Oxide: Nitrous oxide is emitted during agricultural and industrial activities, as well as during combustion of fossil fuels and solid waste.

4. Fluorinated Gases: Hydrofluorocarbons, perfluorocarbons, sulfur hexafluoride, and nitrogen trifluoride are synthetic, powerful greenhouse gases that are emitted from a variety of industrial processes. Fluorinated gases are sometimes used as substitutes for stratospheric ozone-depleting Substances (e.g., chlorofluorocarbons, hydrochlorofluorocarbons, and halons). These gases are typically emitted in smaller quantities, but because they are potent greenhouse gases, they are sometimes referred to as High Global Warming Potential gases ("High GWP gases").

(i) CO2 → 60%

(ii) Chlorofloro Carbon (CFC) → 14%

(iii) Methane (CH4) → 20%

(iv) Nitrous Oxide (N2O) → 6%

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