[en-vahy-ruhn-men-tl-ist, -vahy-ern-]
an expert on environmental problems.
any person who advocates or works to protect the air, water, animals, plants, and other natural resources from pollution or its effects.
a person who believes that differences between individuals or groups, especially in moral and intellectual attributes, are predominantly determined by environmental factors, as surroundings, upbringing, or experience (opposed to hereditarian ).

1915–20; environmental + -ist

environmentalism, noun
antienvironmentalist, noun, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
environmentalist (ɪnˌvaɪrənˈmɛntəlɪst)
1.  an adherent of environmentalism
2.  a person who is concerned with the maintenance of ecological balance and the conservation of the environment
3.  a person concerned with issues that affect the environment, such as pollution

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences for environmentalists
Some environmentalists criticize civilizations for their exploitation of the environment.
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