The major roots and tubers—cassava, potato, sweet potato, and yam—play a significant role in the global food system.They contribute to the energy and nutrition requirements of more than 2 billion people in developing countries and will continue to do so over the next two decades. They are produced and consumed by many of the world's poorest and most food-insecure house holds. Roots and tubers also constitute an important source of employment and in come in rural, and often marginal, areas, and for women. The authors look at current trends in use and production and at projections to the year 2020. Increased production and use of roots and tubers in developing countries have drawn attention to their potential benefits and risks, which this brief describes. The authors conclude with policy recommendations.
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