Today marks the 50th anniversary of Earth Day. A group of environmentally aware and concerned students at the University of Michigan formed the group ENACT during a rather heady time on campus in 1969. Through activity and organization, it led to the first-ever Earth Day in 1970. In Part 1 of a special, Earth Day edition of "Issues of the Environment," WEMU's David Fair caught up with David Allan to look back at the five decades since that event. Allan was a founding member and co-chair of ENACT