The National Wildlife Federation focuses its efforts on five core issue areas (Endangered Habitat, Water Quality, Land Stewardship, Wetlands, and Sustainable Communities) and pursues a range of educational projects, and activist, advocacy, and litigation initiatives, within these core areas.  The National Wildlife Federation Kids' Page is designed to provide environmental education resources and programs online for you, your parents, and your teachers.  These are great sites with plenty for everybody interested in the environment and all of its inhabitants.