April 22, 2008 marks the 38th anniversary of the first observance of Earth Day, first commemorated on April 22, 1970. Former U.S. Senator Gaylord Nelson (D-WI), Earth Day’s co-founder, said he modeled Earth Day on anti-Vietnam War demonstrations called “teach-ins” that then were common on … Continue reading Earth Day 2008 Fact Sheet: The History of Earth Day