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An emission scenario used in a climate projection is

  • A.an observation of the past emissions
  • B.a fixed physical constant of nature
  • C.a plausible future path of emissions
  • D.the model's best forecast of future emissions

Answer: C

Scenarios are inputs chosen to span a range of possible futures, and which one occurs depends on decisions not on physics. Reporting a projection without its scenario is meaningless. Which path occurs is a matter of decisions.

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