In their Policy Forum ("Nutrient imbalances in agricultural development," 19 June, p. 1519), P. M. Vitousek et al. propose a promising idea: Compare solutions to nutrient challenges among countries and regions. However, policies to control nonpoint pollution are not so easy to design. The United States and the European Union are mentioned as examples of places that have reduced nutrient imbalances, yet pollution remains very high in their water.
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José Albiac (2009) studied this question.