It's been nearly 50 years since William O. Douglas stepped down from the United States Supreme Court. Appointed in 1939, Justice Douglas had the distinction of not only being the longest serving member of the United States Supreme Court but for writing nearly 500 dissents, including one in which he said that trees and other elements of nature ought to have the standing to sue for environmental protection. Justice Douglas didn't shy away from either politics or activism. Senior Ninth Circuit Judge M. Margaret McKeown, winner of the ABA's John Marshall and Margaret Brent awards, joins host Richard Ginkowski to discuss her new book, "Citizen Justice: The Environmental Legacy of Justice William O. Douglas -- Public Advocate and Conservation Champion.”