Discussion
Which of the following does not have a direct role in climate change ?
Answer: D
Nitric oxide is the one that has no direct role in climate change. It is a reactive gas that affects ozone and the hydroxyl radical, so its effects are indirect and short lived. Sulphate and nitrate aerosols scatter sunlight and have a direct cooling effect, black carbon aerosols absorb sunlight and warm the atmosphere, and surface ozone is a greenhouse gas that absorbs infrared radiation, so each of those three has a direct role.
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