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The Ecological Revolution
John James Audubon
17 other sections not shown
agricultural Alexander Wilson animals Audubon Society beautiful became become began believed birds Bradley Carver century Concord Congress conservation conservationists destruction early earth ecological ecologists egrets Ehrlich environment environmental farm federal fish forestry forests friends Gifford Pinchot Grand Canyon helped Henry David Thoreau human Ian McHarg interest irrigation ivory-billed woodpeckers John Burroughs John James Audubon John Muir Krutch land later living loved man's Marsh McHarg ment miles million Miss Carson N.W. Washington National Parks natural resources naturalist numbers observed organization Ornithology painting Pennsylvania pesticides Philadelphia plants pollution population Powell Powell's preserve President problems protect published Rachel Carson River scientist servation served Sierra Silent Spring Slabsides soil soon species Stewart Udall Theodore Roosevelt Thoreau tion took trip Tuskegee valley Walden warned West wild wilderness Wilson woods writing wrote York Yosemite Yosemite Valley young