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The central difficulty in evaluating rain enhancement is that

  • A.seeding agents are quite impossible to deliver at all reliably
  • B.nobody understands how ice nucleation works in the first place
  • C.we can never see what that same cloud would have done unseeded
  • D.rainfall cannot be measured with any useful accuracy

Answer: C

There is no way to know what a seeded cloud would have done had it been left alone. Only randomised comparison over many events can address the question, and natural variability is large. The effect sought is small against that background.

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