This course introduces students to epidemiologic investigations of environmental health problems, a fundamental tool for building a sustainable and healthy future. Topics include perennial subjects such as the health effects associated with air and water contaminants and occupational exposure, as well as newer issues such as endocrine and metabolic disruptors, PFAS "forever chemicals", chemicals in consumer products, exposure to mixtures of compounds and environmental epidemiology of pets. The course emphasizes epidemiologic methods, particularly exposure assessment, confounding, and sources of bias. Students gain experience in the critical review and design of related epidemiologic studies. This course counts as concentration credit for epidemiology concentrators.