Discussion
Assertion (A): The Arctic has warmed faster than the global average.
Reason (R): Loss of sea ice exposes darker ocean and the ice albedo feedback amplifies the warming locally.
Answer: D
Both are true and the reason gives the principal mechanism, though changes in atmospheric and oceanic heat transport contribute as well. The amplification is roughly a factor of two or three over the global mean, and it is reproduced by the models.
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