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Three of the following are genuine obstacles to demonstrating a seeding effect. Which is the odd one out?

  • A.large natural variability in rainfall
  • B.no observable unseeded counterfactual
  • C.uncertainty about whether the agent reached the cloud
  • D.an inability to measure precipitation at all

Answer: D

Precipitation can be measured perfectly adequately by gauge and radar. The other three are the genuine difficulties that make evaluation so hard. Measurement itself is not among the problems. Gauges and radar are entirely adequate for the task.

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