Adam Werbach is Co-Founder of yerdle, a new social marketplace that makes it easy to share goods with friends. He was also the Founder of Act Now, which was acquired by Saatchi & Saatchi and the Publicis Groupe, where he served as Chief Sustainability Officer. At age 23, Werbach was elected President of the Sierra Club, the oldest and largest grassroots environmental organization in the US. His latest book, ?Strategy for Sustainability?, published by Harvard Business Press, was named one of the Best Business Books of the Year by Fast Company Magazine. He serves as sustainability correspondent for TheAtlantic.com. Werbach is a graduate of Brown University.