Guardian.co.uk: Global water crisis and cheaper technology sparks surge in desalination

The fundamental reason for the rise of water manufacturing is a simple gap between demand and supply: in 2006 a report from the International Water Management Institute found one in three of the world’s population were “enduring one form or another of water scarcity” – such as “when women work hard to get water, [or] you want to allocate more but can’t”.

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Source: http://www.guardian.co.uk/environment/2010/mar/30/