Who had the greatest impact on the environmental protection movement?

In the modern wilderness preservation movement, important philosophical roles are played by the writings of John Muir who had been activist in the late 19th and early 20th century. Along with Muir perhaps most influential in the modern movement is Henry David Thoreau who published Walden in 1854.

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about the letter or who wrote the letter

i could of w this question but i don't see a " passage " .

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sorry ! ):