Few people have made greater contributions to protecting and improving the environment than the scientist, teacher, activist Dr. Barry Commoner. For half a century, Dr. Commoner has been an international leader in the environmental movement. On the occasion of his eightieth birthday, a symposium was held at which invited speakers discussed his contributions to a wide range of environmental issues. This book, collecting many of the invited papers, provides fascinating insights into the life and work of one of the twentieth century's most influential scientists and social activists. Chapters contributed by other activists, scientists, and scholars including Ralph Nader, Tony Mazzocchi and Peter Montague cover many of Dr. Commoner's major contributions.