Every year about 130,000 km2 of humid tropical rain forest is destroyed. Caused in part by the slash-and-burn practices of both large- and small-scale farmers in Brazil, Cameroon, Indonesia, and elsewhere, the environmental implications of tropical deforestation and its threat to biodiversity and carbon emissions remain a worldwide concern. Yet the small-scale farmers who use slash-and-burn agriculture depend on it to produce food and make a living for their families. Balancing the legitimate interests of rural households and global concerns about tropical deforestation is one of the major challenges of the coming decades.