"United States" . "Environmental movement in the United States#Criticisms of the environmental movement" . "environmental activism" . "environmental activists" . "environmentalism" . "safeguarding the environment" . "environmental protection" . "modern environmental movement" . "Environmental movement in the United States" . "ecologists" . . . . "American environmental movement" . "1960s environmental movement" . . . "environmental movement" . "United States environmental history" . "American environmental movement in the 1970s" . "Environmentalism" . "environmentalist" . "environmental stewardship" . . "environmental and social change movements" . "American environmentalist" . "Environmental_movement_in_the_United_States#Environmentalism_and_politics" . "Environmental movement in the United States" . "environmentalists" . "environmental movement in the United States" . "Environmental_movement_in_the_United_States#History" . "The movement in the United States" . "environmentalism in the United States" . "American green movement" . "environmental legislation in the 1970s" .