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== Enllaços externs ==
{{Projectes germans |Commons= |Commonscat= Aridity|Viccionari=
* [http://www.fao.org/nr/water/issues/scarcity.html Water scarcity] from FAO Water (Food and Agriculture Organization of the United Nations)
* [http://www.waterlifecivilisation.org/ Water Life and Civilisation] project that assess how the changes in hydrological climate have impacted human activities.
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