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The value of the world's ecosystem services and natural capital, Robert Costanza et al, NATURE |VOL 387 | 15 MAY 1997.

1 Jan. 31, 2007, New York Times.

2 Ethanol Can Contribute to Energy, DOI: 10.1126/science.1121416 Science 311, 506 (2006); Alexander E. Farrell, et al.

3 Pimentel, David. "Ethanol Fuels: Energy Security, Economics, and the Environment." Journal of Agricultural and Environmental Ethics, Vol. 4 (1991), p 1-13.

4 Energy Returns on Ethanol Production, (letter), Robert Costanza et al, 23 JUNE 2006 VOL 312 SCIENCE

5 Energy and the U.S. Economy: A Biophysical Perspective, Cutler J. Cleveland, Robert Costanza, Charles A. S. Hall, and Robert Kaufmann, Science 31 August 1984 225: 890-897.

6 Engineering Yeast Transcription Machinery for Improved Ethanol Tolerance and Production, Hal Alper, Joel Moxley, Elke Nevoigt, Gerald R. Fink, Gregory Stephanopoulos, SCIENCE VOL 314 8 DECEMBER 2006.

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