Donald Worster is one of the founders of, and leading figures in, the field of environmental history.Worster’s books include Nature’s Economy: A History of Ecological Ideas; Dust Bowl: The Southern Plains in the 1930s; Rivers of Empire: Water, Aridity, and the Growth of the American West; A River Running West: The Life of John Wesley Powell; and A Passion for Nature: The Life of John Muir; along with several books of collected essays including The Wealth of Nature: Environmental History and the Ecological Imagination.