Aldo Leopold--forester, naturalist, wildlife biologist, conservationist, writer, and environmental philosopher--is best known as the author of A Sand County Almanac and Sketches Here and There (1949), which includes the earliest articulation of the "land ethic" and the "ecological conscience," the idea that human beings, as citizens rather than masters of the land and biosphere, should treat the land with the same set of ethics and the same requirements of conscience with which they treat each other. Known also for his clear and analytical but also lyrical style, Leopold is heralded as a master of both scientific and poetic prose. Educated in forestry, author of the first textbook on game management, he also wrote more than 350 articles published in forestry and wildlife journals as well as many letters to colleagues and friends, book reviews, and papers on conservation of wildlife and land. Environmentalists compare Leopold with John Muir as a...