Allan (2001) gives examples for the Middle East.Earle and Hurton (2003) explore trade as water management option for Southern Africa.Nakayama (2003) suggests a key role for virtual water in the Aral Sea and Mekong Basin.The World Summit on Sustainable Development (paragraph 92) implies that trade agreements under WTO should be evaluated on social and environmental impacts.
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Fraiture et al. (2004) studied this question.