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Environmentalism - Wikipedia
Environmentalism | Ideology, History, & Types | Britannica
Environmentalism - an overview | ScienceDirect Topics
How the largest environmental movement in history was born - BBC
Environmentalism - Conservation, Activism, Sustainability
Environmental movement - Wikipedia
A Brief History of Environmentalism - Greenpeace International
environmentalism summary | Britannica
What is environmentalism? - Explain that Stuff
The History of Environmentalism & Why It Matters - Utopia