Discussion
Which of the following is a 'Green House' gas ?
Answer: A
The greenhouse gas among these is Methane.
A greenhouse gas absorbs the infrared radiation emitted by the Earth's surface and so traps heat. Methane (CH4) does this strongly, much more than carbon dioxide molecule for molecule, and comes from wetlands, paddy fields, livestock and fossil fuel leaks.
Nitrogen and oxygen, which make up about 99% of the air, are made of two identical atoms and do not absorb infrared radiation, so they are not greenhouse gases. Fluorine is a highly reactive element, not an atmospheric greenhouse gas; it is the fluorinated compounds such as CFCs that trap heat.
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