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In page Aral Sea:

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Many different solutions to the problems have been suggested over the years, varying in feasibility and cost, including:

  • Using fewer chemicals on the cotton[citation needed]
  • Cultivating crops other than cotton[citation needed]
  • Redirecting water from the Volga, Ob and Irtysh rivers to restore the Aral Sea to its former size in 20–30 years at a cost of US$30–50 billion[3]