Discussion
Assertion (A): A polluted cloud is brighter than a clean one holding the same amount of liquid water.
Reason (R): More and smaller droplets present a greater total surface area to scatter sunlight.
Answer: C
Both are true and the reason gives the optics, and this brightening is known as the Twomey or first indirect effect. It represents a cooling influence that partly offsets greenhouse warming. Its magnitude remains among the least certain terms in the energy budget.
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