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English definition of “environmentalist”

environmentalist

noun [C]    /ɪnˌvɑɪ·rənˈmen·təl·ɪst, -ˌvɑɪ·ərn-/
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 noun from the Cambridge Academic Content Dictionary © Cambridge University Press)
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