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Discussion

Weather modification research declined in many countries after the 1970s chiefly because

  • A.aircraft became unavailable for the work
  • B.repeated trials failed to demonstrate convincing effects
  • C.the underlying physics was eventually shown to be quite impossible
  • D.seeding agents were banned internationally

Answer: B

Early optimism was not sustained by the results of carefully designed experiments. Interest has revived somewhat with better instrumentation and with growing pressure on water supplies. Water scarcity has revived interest independently of the science.

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