Discussion
Which of the following is not a green-house gas ?
Answer: B
The gas that is not a greenhouse gas is argon (Ar).
A greenhouse gas absorbs and re-emits infrared radiation. Molecules with three or more atoms, or with an unequal charge distribution, can vibrate in ways that absorb infrared. Argon is a monatomic noble gas with no such vibrations, so although it is about 0.93% of the air, it traps no heat.
Ozone, carbon dioxide and methane are all greenhouse gases: carbon dioxide is the largest human contributor, methane is far more potent per molecule, and ozone in the troposphere also warms the surface.
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