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A little more than a year ago, on a trip to Nairobi, Kenya, some colleagues and I met a 12-year-old Masai boy named Richard Turere, who told us a fascinating story. His family raises livestock on the ...

† Brook Byers Institute for Sustainable Systems, Georgia Institute of Technology, Atlanta, Georgia 30322-0595, United States ‡ School of Civil and Environmental Engineering, Georgia Institute of ...