This book describes the emergence of ecological understanding among the English Romantic poets, arguing that this new holistic paradigm offered a conceptual and ideological basis for American environmentalism. Coleridge, Wordsworth, Blake, John Clare, and Mary Shelley all contributed to the fundamental ideas and core values of the modern environmental movement; their vital influence was openly acknowledged by Emerson, Thoreau, John Muir, and Mary Austin. By revealing hitherto unsuspected links between English and American nature writers, this book elucidates the Romantic origins of American environmentalism.