Discussion
Which one of the following does not contribute to climate change ?
Answer: A
The gas that does not contribute to climate change is the option the key gives as NO.
Nitric oxide is short-lived and is not a greenhouse gas, although it takes part in the reactions that form ozone. Ozone, sulphur hexafluoride and the hydrofluorocarbons are all greenhouse gases: ozone absorbs infrared radiation in the troposphere, SF6 has an extremely high global warming potential and the HFCs are potent synthetic gases. Of the four, only NO is left as the one outside the group.
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