Book excerpt: This encyclopedia introduces readers to American poetry, fiction and nonfiction with a focus on the environment (broadly defined as humanity's natural surroundings), from the discovery of America through the present. The work includes biographical and literary entries on material from early explorers and colonists such as Columbus, Bartolome de Las Casas and Thomas Harriot; Native American creation myths; canonical 18th- and 19th-century works of Jefferson, Emerson, Thoreau, Whitman, Hawthorne, Twain, Dickinson and others; to more recent figures such as Jack London, Ernest Hemingway, Norman Mailer, Stanley Cavell, Rachel Carson, Jon Krakauer and Al Gore. It is meant to provide a synoptic appreciation of how the very concept of the environment has changed over the past five centuries, offering both a general introduction to the topic and a valuable resource for high school and university courses focused on environmental issues.