Terry Hartig, of the University of Uppsala; Richard Mitchell, of the University of Glasgow and the Centre for Research on Environment, Society, and Health; Sjerp de Vries, of the Alterra Institute and the University of Wageningen; and Howard Frumkin, of the University of Washington in Seattle, talk about their article "Nature and Health," which they wrote for the 2014 Annual Review of Public Health. They discuss the current state of research on the impact that contact with nature has on individual and population health.