Photographers have found the American landscape irresistible for the past 250 years. From north to south, east to west, our land is varied and breathtakingly beautiful in its many forms. Over time we have documented its natural evolution and its resilience in the face of both natural forces and human intervention. Today, however, it faces unprecedented threats: climate change exacts a heavy toll on the environment, while human greed and neglect place equally severe strains on its survival.