Abstract
During the past two decades, population growth, improvement in incomes and diversification of diets have steadily increased the demand for food. Prior to 2000, food prices were in decline, largely through record harvests. At the same time, however, public and private investment in agriculture, especially in the production of staple food, decreased, which led to stagnant or declining crop yields in most developing countries. Rapid urbanization has led to the conversion of farmland to non-agricultural uses, and low food prices have encouraged farmers to shift to alternative food and non-food crops. Long-term unstable land use has also caused land degradation, soil erosion, nutrient depletion, water scarcity and disruption of biological cycles.
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