Put simply, it may be more cost effective to import oranges from a region that has plenty of water than to try and de-salinate water at home to irrigate an orchard. From Wordnik.com. [Cleantech Blog] Reference
If the current growing population of 6.7 billion is considered a benefit to mankind, than dams are beneficial - If the vulnerability of dense populations downstream of dams is a benefit to mankind, than dams are beneficial - If agricultural production on arid lands that require large volumes of water that salinate the soil and demand large inputs of fossil-fuel based fertilizers and pesticides that runoff and pollute groundwater is considered a benefit to mankind, than dams are beneficial - If the displacement of 80 million people from their homelands to accommodate dams is a benefit to mankind, than dams are beneficial - if the destruction of life-supporting ecosystems and fishery resources is a benefit to mankind, than dams are beneficial - If the inequitable sharing of benefits and costs is a benefit to mankind, than dams are beneficial - If debt burden, cost overruns, deferred maintenance costs and the impoverishment of people is a benefit to mankind, than dams are the most benefic. From Wordnik.com. [Dissident Voice] Reference
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