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As the world's population increases, temperature rise and societies develop, will water become the "credit crunch" of tomorrow?

Parts of India are on track for severe water shortages, according to results from Nasa's gravity satellites. The Grace mission discovered that in the country's north-west - including Delhi - the water table is falling by about 4cm (1.6 inches) per year. Writing in the journal Nature, they say rainfall has not changed, and water use is too high, mainly for farming.