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Three of the following are ways of evaluating a climate model. Which is the odd one out?

  • A.confirming that it agrees with other models
  • B.comparing its mean climate with observations
  • C.testing its simulation of the seasonal cycle
  • D.checking whether it reproduces past climate changes

Answer: A

Agreement between models says nothing about whether either is right, since they share assumptions and sometimes code. The other three all test the model against something independent. Shared assumptions produce shared errors.

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