American Henry David Thoreau, a poet, essayist, philosopher, and naturalist, is considered to be one of the fathers of the environmental movement. In many of his books, appreciation for nature was a major theme. For example, in his piece Walden (otherwise known as Life in the Woods) Thoreau recalls the two years he spent living and growing to love the purity of nature at Walden Ponds. Naturalists John Burroughs, John Muir and Herbert Wendell Gleason in the late nineteenth century, and Author Edwin Way Teale in the twentieth century strived to popularize Thoreau’s work and allowed it to guide the modern environmental and wilderness preservation movement.
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