Global sand trade is paving the way for a tragedy of the sand commons

Aurora Torres, Museo Nacional de Ciencias Naturales, Spanish Research Council (MNCN-CSIC), Madrid, Spain, Jodi Brandt, Boise State University, Human-Environment Systems, Boise, United States, Kristen Lear, Warnell School of Forestry and Natural Resources, University of Georgia, Athens, GA, United States and Jianguo Liu, Michigan State University, Center for Systems Integration and Sustainability, East Lansing, United States