Book excerpt: Examines projections of global supply of and demand for food through the year 2020. Looks closely at how alternative population, investment, and trade scenarios will affect food security and nutrition status, especially in the developing world. The authors argue that the world is at risk of maintaining its two-tiered system of food security, with rich and rapidly growing countries enjoying abundant, affordable food supplies and poor countries suffering from malnutrition and food scarcity. National governments and international agencies can alter this situation through their investment decisions. Charts and tables.