Professor Glenn Stone discusses the multiple meanings of 'sustainability' and describes his research into agricultural practices in Nigeria, India, and the U.S. Stone is a professor of sociocultural anthropology and environmental studies at Washington University in St. Louis. His blog, fieldquestions, covers issues relating to food, farming, and biotechnology. 

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Photo by Glenn Stone, 2002. Farmers in rural Warangal display the village’s first box of Bt cotton seed, purchased for 1600 rupees (approx. $40). This amount was four times the cost of a box of conventional cotton seed, and 32 times the cost of a day of farm labor.
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