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ViewpointGlobal Food Security: Challenges and PoliciesGlobal food security will remain a worldwide concern for the next 50 years and beyond. Recently, crop yield has fallen in many areas because of declining investments in research and infrastructure, as well as increasing water scarcity. Climate change and HIV/AIDS are also crucial factors affecting food security in many regions. Although agroecological approaches offer some promise for improving yields, food security in developing countries could be substantially improved by increased investment and policy reforms. International Food Policy Research Institute, 2033 K Street, N.W., Washington, DC 20006, USA. * To whom correspondence should be addressed. E-mail: m.rosegrant{at}cgiar.org
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