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Global water crisis: too little, too much, or lack of a plan?

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With each step up the economic ladder, people demand more water for sanitation, industry, hydroelectric power, and water-intensive diets – such as preferring beef to wheat, a shift that requires 10 times as much water per kilogram to produce. Urban-rural competition for water has already pushed countries to import grains – "virtual water" – or, in the case of wealthier countries like China, South Korea, and Saudi Arabia, to lease land in developing countries.

By 2030, the Water Resources Group forecasts, global water requirements may outstrip sustainable use by 40 percent. And almost half the world's people will be living under severe water stress, predicts the Organization for Economic Cooperation and Development (OECD).

Already, water stress – where the reliable water supply is being used up more quickly than it can be replenished – is widespread and is expected to increase significantly in the years ahead, particularly in North Africa, the Middle East, and Asia. By 2050, according to the UN's Food and Agriculture Organization, 1 in 5 developing countries will face water shortages.

Too many straws in the glass

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