Happy Earth Day! Annually, April 22 marks the anniversary of the environmental movement that was established in 1970. Inspired by student anti-war protests and concern of environmental pollution, Wisconsin Senator Gaylord Nelson tapped U.S. Rep. Pete McCloskey of California to co-chair a movement. They enlisted the help of Dennis Hayes, an activist, to form a national environmental network and to organize events, including teach-ins on college campuses.