There’s growing concern that endocrine disrupting chemicals have been linked to health problems in humans, and this month a report issued by the World Health Organization and the United Nations Environment Programme called these chemicals a "global threat" that should be addressed. Heather Patisaul, Associate Professor, Department of Biology, North Carolina State University, and Urvashi Rangan, director of the Consumer Safety and Sustainability Group at Consumer Reports, explain what endocrine disruptors—like BPA, phthalates, some pesticides and fire retardants—are, where they’re found, and how they affect human development and health.