Green - an environmentalist who belongs to the Green Party

crusader, meliorist, reformer, reformist - a disputant who advocates reform

tree hugger - derogatory term for environmentalists who support restrictions on the logging industry and the preservation of forests

Carson, Rachel Carson, Rachel Louise Carson - United States biologist remembered for her opposition to the use of pesticides that were hazardous to wildlife (1907-1964)

Barbara Ward, Baroness Jackson of Lodsworth, Ward - English economist and conservationist (1914-1981)