Just to clarify do you mean naturalist (as in one who studies fauna and/or fauna) or as your examples suggest rather environmentalist - though I suspect the term was not used much until the end of Tolkien's life.
While I am sure naturalists tend to be environmentalist, not all environmentalists could call themselves naturalists.
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“But Finrod walks with Finarfin his father beneath the trees in Eldamar.”
Christopher Tolkien, Requiescat in pace
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