Discussion
Consider the following statements about cloud seeding.
1. Glaciogenic seeding supplies ice nuclei to supercooled cloud.
2. Hygroscopic seeding supplies large nuclei to warm cloud.
3. Seeding reliably produces large increases in rainfall.
Answer: C
The first two are correct and describe the two approaches. The third overstates the evidence, since randomised trials have generally found small and statistically difficult effects. Natural variability is far larger than any claimed increase.
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