environmentalist
noun
en·vi·ron·men·tal·ist
in-ˌvī-rə(n)-ˈmen-tə-ləst
-ˌvī(-ə)r(n)-
1
: an advocate of environmentalism
2
: one concerned about environmental quality especially of the human environment with respect to the control of pollution
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Merriam-Webster unabridged
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