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Corn and soy are currently used to produce nearly all of the
biofuels (ethanol and biodiesel) in the United States.
Cellulosic ethanol, while not currently produced in large
quantities, is also considered to be a promising biofuel
pathway. The purpose of this study was to consider
alternative feedstocks that could be converted to biodiesel
or ethanol using the well understood processes of
fermentation or transesterification and which are not
currently used to make biofuels in the US. Four different
feedstocks were considered: sugar cane, citrus waste,
cottonseed, and microalgae. A Life Cycle Assessment (LCA)
approach was used to examine the land occupation
requirements, water use, net energy, and emissions to air,
including greenhouse gases carbon dioxide (CO2), methane
(CH4) and nitrous oxide (N2O).
Although the
research described on this web site has been
funded by the United States Environmental
Protection Agency through cooperative agreement
XA-83379501-0, it has not been subjected to the
Agency's required peer and policy review and
therefore does not necessarily reflect the views
of the Agency and no official endorsement should
be inferred. |
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