Jennifer Jacquet is an assistant professor in the Department of Environmental Studies at New York University. She is interested in large-scale cooperation dilemmas, such as overfishing and climate change, and the mechanisms that might help provide the impetus for large-scale behavior changes. Her first book, Is Shame Necessary? New uses for an Old Tool, will be published by Pantheon Press in March 2015. For more information, see: http://jenniferjacquet.com.