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Three of the following are climate intervention proposals acting on clouds. Which is the odd one out?

  • A.marine cloud brightening with sea salt
  • B.cirrus thinning by ice nucleus seeding
  • C.increasing low cloud cover over subtropical oceans
  • D.reforestation to absorb carbon dioxide

Answer: D

Correct answer: reforestation to absorb carbon dioxide

Reforestation removes a greenhouse gas and is a carbon measure, not a cloud one. The other three act on clouds and their radiative effect: brightening marine stratocumulus with sea salt, thinning cirrus so more heat escapes, and increasing low cloud cover over subtropical oceans.

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