Revolution Romantics Muir, Ruskin, Thoreau: late 19th C Early Scientists Brandeis, Pinchot, Leopold: 19th-20th 20th C disasters Minamata Bay, Torrey Canyon, Chernobyl: 60s-80s Scientists Carson, Meadows, Commoner, Ehrlich: 60s, 70s Green Ideologues Kelly, Bahro, Porritt: 80s