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Between 2000 and 2010, groundwater depletion caused by irrigation

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increased 22 percent.

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The most overexploited aquifers all show evidence of groundwater depletion from irrigation.

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In drier countries like Kuwait, Iran and Saudi Arabia,

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crops require extremely large amounts of groundwater-depleting irrigation to grow.

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International trade moves these crops

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between countries, so in some cases, the countries consuming the most

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groundwater depletion-linked crops may have more water supplies, relatively speaking.

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However, importers of groundwater depleting-crops 

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face a potential future supply risk,

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as overexploited aquifers may not be able to continue providing water at current levels in the long-term.