Lesley Stahl reports on disturbing new evidence that our planet's groundwater is being pumped out much faster than it can be replenished.
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Global Risks
According to the World Economic Fourm's Global Risks 2013 report, the water supply crisis is ranked as a top-five risk, in terms of both its likelihood to happen and its impact. With global freshwater demand projected to exceed current supply by over 40% by 2030...