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"A Billion people don't have access to sufficient water and with water use growing at twice the rate of the population, water will surpass oil as the most desired and needed liquid. BBC sent 4 correspondents around the world to investigate. Then Matt Frei talkes with Jeffrey Sachs of Columbia University."

The recent World Economic Forum Global Risks report identifies the 10 "biggest threats to the stability of the world" over the next 10 years. These are difficult times, and the catalogue of potential threats includes many that may seem familiar, including high unemployment, war and the spread of infectious disease.