The Local Environmental Observer (LEO) Network is comprised of local experts who share their knowledge and experiences to describe environmental events in their communities. They apply local and traditional knowledge and modern technology to share their observations and raise awareness about the changing conditions of the circumpolar north. There are over 100 LEOs located through out Alaska and Canada in over sixty communities. The LEO Network is hosted by the Center for Climate and Health at the Alaska Native Tribal Health Consortium. It is supported by the United States Environmental Protection Agency, Indian Health Service, and the Centers for Disease Control. Members of the LEO Network are employed in the environmental, health, natural resource, or community services fields for federally recognized tribes and tribal organizations.