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Environmentalism - Wikipedia
Environmental movement - Wikipedia
Environmentalism | Ideology, History, & Types | Britannica
Environmentalist - Wikipedia
Environmentalism - an overview | ScienceDirect Topics
Environmentalism - Conservation, Activism, Sustainability
How the largest environmental movement in history was born - BBC
environmentalism summary | Britannica
A Brief History of Environmentalism - Greenpeace International
Environmentalism - New World Encyclopedia