noun
a person who advocates for the protection and preservation of the environment and wildlife
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The conservationist worked tirelessly to protect the endangered species in the national park.
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My friend is a total conservationist and is always talking about recycling and reducing waste.
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I heard that new movie star is a real tree hugger, a true conservationist at heart.
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The artist was a conservationist of old traditions, always preserving the techniques of the past in his work.