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Pros
  • Little pollution
  • Produced in area where few people live
  • Dams can reduce risk of flooding and water shortage
  • Lake used for water sports
Cons
  • Expensive to build
  • Flood large area and destroys the environment
  • silt stays in reservoir rather than helping to fertilise nearby land
  • Methane and carbon dioxide given off by rotting vegetation in lake
  • Fish cannot migrate easily upstream