U.S. Supreme Court Justice William O. Douglas was a giant in the legal world, even if he is often remembered for his four wives, as a potential vice-presidential nominee, as a target of impeachment proceedings, and for his tenure as the longest-serving justice from 1939 to 1975. His most enduring legacy, however, is perhaps his advocacy for the environment.Douglas was the spiritual heir to early twentieth-century conservation pioneers such as Teddy...