Discussion
Which one of the following does not contribute significantly to global warming ?
Answer: A
The gas that does not contribute significantly to global warming is NO, nitric oxide.
Nitric oxide is a short-lived air pollutant that takes part in forming smog and acid rain, but it is not itself a significant greenhouse gas. It should not be confused with nitrous oxide (\(\mathrm{N_{2}O}\)), which is a powerful, long-lived greenhouse gas.
The others are greenhouse gases: tropospheric ozone absorbs infrared radiation, sulphur hexafluoride (\(\mathrm{SF_{6}}\)) is the most potent greenhouse gas known and is covered by the Kyoto Protocol, and hydrofluorocarbons (HFCs) are also Kyoto gases with high warming potential.
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