Home > General The history of Earth Day in Philadelphia – YouTube Anna K. Berg, assistant professor in the Department of History at University of Pennsylvania, talks about the history of Earth Day in Philadelphia. Categories:General Tags:Anna K. BergDepartment of History at University of PennsylvaniaEarth Dayhistory of Earth DayPApennsylvaniaPhiladelphiauniversity of pennsylvaniaUSAYouTube Bob Bruhin Bob Bruhin is a web developer, tour guide, art photographer, author, blogger, and graphic designer. His love of urban landscapes, especially in post-industrial Philadelphia, PA, leads him to document some of the darker corners of his city. Share Share on Twitter Share on LINE Share on Facebook Save to Pocket Related Posts General General General General General Panorama 3927 hdr pregamma 1 mantiuk06 contrast ma by bruhinb on DeviantArt General Prev Post The Esoteric Doctrine of the Seven Rays – YouTube Next Post Miasma and oracles: How ancient Greeks understood plagues | Europe, News, Paganism, U.S., Witchcraft, World