Ethanol does well on efficiency, but only so-so for the environment.
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References
FarrellA. E., et al. Science, 311. 506 - 508 (2006).
RagauskasA. J., et al. Science, 311. 484 - 489 (2006).
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Peplow, M. Biofuels get mixed review. Nature (2006). https://doi.org/10.1038/news060123-13
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DOI: https://doi.org/10.1038/news060123-13
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