Acknowledgments

I am grateful for the support of U.S. Agency for International Development/Africa Bureau/Office of Sustainable Development (AFR/SD), the Earth Resources Observation Systems Data Center/U.S. Geological Survey, the Centre for Environmental Studies at Lund University, Sweden, and a Dean's

Fellowship from the University of Arizona. Special thanks go to Agatha Thiaw, Djibril Diouf, and AlHassan Cissé for their invaluable contribution to a year of fieldwork; Lennart Olsson for his input to the STELLA model; Bill Parton and Steve DelGrosso for their help with CENTURY; and all farmers in the Old Peanut Basin who participated in the study.

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