In ordertomeetthefuturedemandforenergyandtoimprove
energy securityintheUSA,theBiofuelsSecurityActof2007pro-
posed arequirementof37.9Hm3 of renewablefuelsby2010,
113.6Hm3 by 2020,and227.1Hm3 by 2030.Also,arecentUS
congressional mandaterequiresthat79.5Hm3 of renewableliq-
uid fuelmustcomefromfeedstockotherthanmaize(Ugarte etal.,
2010). Suchamandatewouldrequiretheuseofcropandfor-
est residuesanddedicated-energycropsaspotentialsourcesof