Much of both the current and projected future global burden of disease and injury is attributed to environmental sources of exposure or changes in environmental conditions. Environmental epidemiologists have: determined whether increases in adverse health outcomes are attributable to environmental exposures; tracked down etiological linkages between environmental exposures-conditions and health status in particular populations; estimated the attributable burden both in the past and projecting into the future to inform programs and policies; and increasingly, evaluated the impact of policy and program interventions aimed at reducing the environmental burden of disease. This environmental epidemiology course will include each of these activities in environmental epidemiology.