Energy Policy, Vol.35, No.2, 1414-1416, 2007
Opportunities ('costs) matter: A comment on Pimentel and Patzek "Ethanol production using corn, switchgrass, and wood; biodiesel production using soybean and sunflower"
The energy balance for different crops reported by Pimentel and Patzek ignores opportunity costs. Including opportunity costs substantially changes the results and leads to different conclusions. (c) 2006 Elsevier Ltd. All rights reserved.