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Climate sensitivity is usually defined as the equilibrium warming for

  • A.a one degree rise in ocean temperature
  • B.a doubling of the water vapour content
  • C.a doubling of the carbon dioxide level
  • D.a one per cent rise in the solar output

Answer: C

It is a convenient benchmark that packages the net effect of all the feedbacks into a single number. Its uncertainty is dominated by the cloud feedback. It packages every feedback into one figure. Doubling is the conventional benchmark used.

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