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

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As a result, half of the global population lives in countries where water tables are rapidly falling. These supply problems are compounded by new land use patterns, like deforestation and soil grading, as well as leakage from poorly maintained infrastructure in cities.

Climate complications

To make things worse, climate change is expected to cause water shortages in many parts of the world, making ground water all the more important as a buffer.

The spike in global grain prices caused by the US drought last summer, on the heels of an epic winter drought in Spain and summer heat waves in southern Europe, showed the cascade effect of the sort of droughts that the Intergovernmental Panel on Climate Change expects will multiply in the decades ahead.

Not surprisingly, the greatest impact is on the poor. While American households spend, on average, 13 percent of their budgets on food, that expenditure is often 50 percent or more in the developing world. So a spike in food prices can trigger explosive riots like those that erupted there in the past five years.

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