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Here is another article about the Saudi production of wheat. They are phasing out local production of wheat by 2016 because they were depleting their own fossil water resources.
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Check this article of the LA Times . They claim that Africa will be plundered by foreign investors who want to buy land, invest in irrigation and transfer technology. I consider at least risky, or even plain stupid, to invest in a country where exports can be blocked at anytime and the cries for nationalization...