References: Culverco, I. (2004). Conserve resources. Retrieved March 16, 2008 from http://www.midamericanenergy.com/eew/help/conserve.html Dell, M. (2004, Fall). The Devil 's Excrement. Harvard International Review, 26(3), 38-41. Retrieved March 16, 2008, from Academic Search Premier database. Machado, I., and Suslick, S. (n.d.). Non-Renewable Resources. Earth System: History and Natural Variable. Retrieved March 16, 2008 from http://www.eolss.net/ebooks/Sample%20Chapters/C12/E1-01-02-11.pdf Pezzey, J. (2004, June). Sustainability Policy and Environmental Policy. Scandinavian Journal of Economics, 106(2), 339-359. Retrieved March 16, 2008, from EconLit with Full Text database
References: Culverco, I. (2004). Conserve resources. Retrieved March 16, 2008 from http://www.midamericanenergy.com/eew/help/conserve.html Dell, M. (2004, Fall). The Devil 's Excrement. Harvard International Review, 26(3), 38-41. Retrieved March 16, 2008, from Academic Search Premier database. Machado, I., and Suslick, S. (n.d.). Non-Renewable Resources. Earth System: History and Natural Variable. Retrieved March 16, 2008 from http://www.eolss.net/ebooks/Sample%20Chapters/C12/E1-01-02-11.pdf Pezzey, J. (2004, June). Sustainability Policy and Environmental Policy. Scandinavian Journal of Economics, 106(2), 339-359. Retrieved March 16, 2008, from EconLit with Full Text database