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Assertion (A): Near term climate projections are dominated by internal variability rather than by scenario choice.
Reason (R): Emissions under different scenarios have not yet diverged much in the first decade or two.

  • A.Both A and R are true, and R is the correct explanation of A
  • B.Both A and R are true, but R is not the correct explanation of A
  • C.A is true but R is false
  • D.A is false but R is true

Answer: A

Both are true and the reason gives the cause, and it means the near term is genuinely uncertain in a way that better models cannot remedy. Effort spent refining the models buys most where the scenario and the response dominate instead.

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