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All of the following are genuine difficulties in evaluating cloud seeding EXCEPT

  • A.the physics of ice nucleation is entirely unknown
  • B.natural rainfall variability is extremely large
  • C.the unseeded outcome can never be observed
  • D.suitable clouds are not always present when needed

Answer: A

The physics is reasonably well understood; the difficulty is statistical rather than theoretical. The other three are the standard obstacles to a convincing evaluation. The problem is one of statistics rather than of physics.

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