How and why have Americans living at particular times and places used and transformed their environment? How have political systems dealt with conflicts over resources and conservation? This is the only major reference work to explore all the major themes and debates of the burgeoning field of environmental history. Humanity ́s relationship with the natural world is one of the oldest and newest topics in human history. The issue emerged as a distinct field of scholarship in the early 1970s and has been growing steadily ever since. The discipline ́s territory and sources are rich and varied.