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In the world's driest places, "fossil water" is becoming as valuable as fossil fuel, experts say. This ancient freshwater was created eons ago and trapped underground in huge reservoirs, or aquifers. And like oil, no one knows how much there is—but experts do know that when it's gone, it's gone. (See a map of the world's freshwater in National Geographic magazine.) "You can apply the economics of mining because you are depleting a finite resource," said Mike Edmunds, a hydrogeologist at Oxford University in the Great Britain. In the meantime, though, paleowater is the only option in many water-strapped nations. (...)

The article:
http://news.nationalgeographic.com/news/2010/05/100505-fossil-water-radioactive-science-environment/

Basic information:
http://en.wikipedia.org/wiki/Fossil_water