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Assertion (A): Cirrus thinning differs from most solar geoengineering proposals.
Reason (R): It acts on outgoing infrared radiation rather than on incoming sunlight.

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

Answer: C

Both are true and the reason gives the distinction, and this makes it effective at night as well as by day. Solar reflection schemes by contrast do nothing during the night. The distinction matters at high latitudes particularly.

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