Have to use these sources at least, but can use others too.
Nash, Roderick, Wilderness and the American Mind (4th ed., New Haven: Yale University Press, 2001)
Deming, Alison H., and Lauret E. Savoy, eds., The Colors of Nature: Culture, Identity, and the Natural World (Minneapolis: Milkweed Editions, 2003).
McNeill, John, Something New Under the Sun: An Environmental History of the Twentieth-Century World (New York: W. W. Norton, 2001)
