| 1. |
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David Tilman, Jason Hill, & Clarence Lehman, "Non-Negative Biofuels from Low-Input High-Diversity Grassland Biomass,"Science 314, 8 December 2006, pp. 1598-1600. |
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| 2. |
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M. Obersteiner, Ch. Azar, P. Kauppi, K. Mollersten, J. Moreira, S. Nilsson, P. Read, K. Riahi, B. Schlamadinger, Y. Yamagata, J. Yan, J.-P. van Ypersele, "Managing Climate Risk," Science 294, 26 October. 2001, pp. 786-787. |
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| 3. |
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Florian Kraxner, Sten Nilsson, Michael Obersteiner, "Negative emissions from BioEnergy use, carbon capture and sequestration (BECS)—the case of biomass production by sustainable forest management from semi-natural temperate forests," Biomass & Bioenergy 24 (2003) p. 293. |
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| 4. |
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David Tilman, et. al., op. cit., p. 1600.
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| 5. |
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Ibid, p. 1599. |
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| 6. |
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Ibid, Supporting Online Material. |
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| 7. |
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Ibid, p. 1598. |
