noun

environmentalist

environmentalist

She is a dedicated environmentalist.

She is a dedicated environmentalist.

Environmentalists protested the new factory.

Environmentalists protested against the new factory.

(a/an) environmentalist a person who is concerned with or advocates the protection of the environment. He became an environmentalist after college.

Synonyms: conservationist, ecologist, green activist

From 'environmental' + '-ist' (a person who does or believes something).

An '-ist' is a person. So, an environmentalist is a person concerned with the environment.

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