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Assertion (A): Aerosol indirect effects are among the largest uncertainties in estimates of climate forcing.
Reason (R): They depend on cloud responses that vary greatly and are difficult to observe directly.

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

Answer: B

Both are true and the reason gives the difficulty, and the response of cloud amount to aerosol is particularly hard to separate from meteorological variation. Successive assessments have narrowed the range only slowly.

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