Sample Lifecycle Biofuels References
http://www.transportation.anl.gov/pdfs/TA/271.pdf
http://www.nrdc.org/air/energy/biofuels/contents.asp
http://www.pnas.org/cgi/content/abstract/105/2/464
http://www.esajournals.org/perlserv/?request=get-abstract&doi=10.1890%2F05-2018&ct=1
http://www.sciencemag.org/cgi/content/short/311/5760/506