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Discussion

Consider the following statements about the pattern of observed warming.
1. The Arctic has warmed considerably faster than the global mean.
2. Land has warmed faster than the ocean.
3. Warming has been uniform across the globe.

  • A.1 only
  • B.All of them
  • C.1 and 2 only
  • D.3 only

Answer: C

The first two are correct and both follow from well understood mechanisms. The third is wrong, and the spatial pattern is itself part of the attribution evidence. Uniform warming was never expected. Pattern is part of the attribution case.

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