the advance of culture and technology as releasing humans from dependence on the natural world and providing them with the means to manage it [and] celebrated human mastery over other forms of life and the natural environment, and expected technological improvement and economic growth to accelerate”. Environmental historians intended to develop a post-colonial historiography that was "more inclusive in its narratives". Moral and political inspiration Moral and political inspiration to environmental historians has come from American writers and activists such as Henry Thoreau, John Muir, Aldo Leopold, and Rachel Carson. Environmental history "frequently promoted a moral and political agenda although it steadily became a more scholarly enterprise". Early attempts to define the field were made in the United States by Roderick Nash in “The State of Environmental History” and in other works by frontier historians Frederick Jackson Turner, James Malin, and Walter Prescott Webb, who analyzed the process of settlement. Their work was expanded by a second generation of more specialized environmental historians such as Alfred Crosby, Samuel P. Hays, Donald Worster, William Cronon, Richard White, Carolyn Merchant, J. R. McNeill, Donald Hughes, and Chad Montrie in the United States and Paul Warde, Sverker Sorlin, Robert A. Lambert, T.C. Smout, and Peter Coates in Europe. British Empire Although environmental history was growing rapidly as a field after 1970 in the United States, it only reached historians of the British Empire in the 1990s.Madhav Gadgil and Ramachandra Guha, This fissured land: an ecological history of India (1993). Gregory Barton argues that the concept of environmentalism emerged from forestry studies, and emphasizes the British imperial role in that research. He argues that imperial forestry movement in India around 1900 included government reservations, new methods of fire protection, and attention to revenue-producing forest management. The result eased the fight between romantic preservationists and laissez-faire businessmen, thus giving the compromise from which modern environmentalism emerged. In recent years numerous scholars cited by James Beattie have examined the environmental impact of the Empire. Beinart and Hughes argue that the discovery and commercial or scientific use of new plants was an important concern in the 18th and 19th centuries. The efficient use of rivers through dams and irrigation projects was an expensive but important method of raising agricultural productivity. Searching for more efficient ways of using natural resources, the British moved flora, fauna and commodities around the world, sometimes resulting in ecological disruption and radical environmental