a person who is concerned about the natural environment and wants to improve and protect it
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NAmE//ɪnˌvaɪərnˈmɛntlˌɪzəm//, NAmE//ɪnˌvaɪrənˈmɛntlˌɪzəm//
noun [uncountable]See environmentalist in the Oxford Advanced Learner's DictionaryCheck pronunciation: environmentalist