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English definition of “environmentalist”

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environmentalist

noun [C]  /ɪnˌvɑɪ·rənˈmen·təl·ɪst, -ˌvɑɪ·ərn-/ us  
earth science a person who has a specially strong interest in or knowledge of the natural environment, and who wants to preserve it and prevent damage to it: Environmentalists are working to improve the quality of our lakes and rivers.
(Definition of environmentalist from the Cambridge Academic Content Dictionary © Cambridge University Press)
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