Abstract
Life-cycle analysis (LCA) is an important tool used to assess the energy and environmental impacts of biofuels. Here, we review biofuel LCA methodology and its application in transportation fuel regulations in the United States, the European Union, and the United Kingdom. We examine the application of LCA to the production of ethanol from corn, sugarcane, corn stover, switchgrass, and miscanthus. A discussion of methodological choices such as co-product handling techniques in biofuel LCA is also provided. Further, we discuss the estimation of greenhouse gas (GHG) emissions of land use changes (LUC) potentially caused by biofuels, which can significantly influence LCA results. Finally, we provide results from LCAs of ethanol from various sources. Regardless of feedstock, bioethanol offers reduced GHG emissions over fossil-derived gasoline, even when LUC GHG emissions are included. This is mainly caused by displacement of fossil carbon in gasoline with biogenic carbon in ethanol. Of the ethanol pathways examined, corn ethanol has the greatest life-cycle GHG emissions and offers 30% reduction in life-cycle GHG emissions as compared to gasoline when LUC GHG emissions are included. Miscanthus ethanol demonstrates the highest life-cycle GHG emissions reductions compared to gasoline, 109%, when LUC GHG emissions are included.
The submitted manuscript has been created by UChicago Argonne, LLC, Operator of Argonne National Laboratory (“Argonne”). Argonne, a U.S. Department of Energy Office of Science laboratory, is operated under Contract No. DE-AC02-06CH11357. The U.S. Government retains for itself, and others acting on its behalf, a paid-up nonexclusive, irrevocable worldwide license in said article to reproduce, prepare derivative works, distribute copies to the public, and perform publicly and display publicly, by or on behalf of the Government.
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Notes
- 1.
N2O emissions for corn stover ethanol from supplemental fertilizer application are treated as net zero. N2O emissions from supplemental fertilizer applied to the field are assumed to be equal to N2O emissions that would have been emitted if the stover had been left on the field in a scenario without biofuel production because the N content of the removed stover and the supplemental fertilizer are equal.
- 2.
Mostly based on Walter et al. (2013).
Abbreviations
- Acronym:
-
Definition
- AEZ:
-
Agro-ecological zone
- BNDES:
-
Brazilian Development Bank
- BLUM:
-
Brazilian land use model
- CARB:
-
California Air Resources Board
- CCLUB:
-
Carbon calculator for land use change from biofuels production
- CGE:
-
Computable general equilibrium
- CGEE:
-
Center for Global Environmental Education
- CHP:
-
Combined heat and power
- COLE:
-
Carbon online estimator
- DOE:
-
Department of Energy
- EC:
-
European Commission
- EIO:
-
Economic input-output
- EISA:
-
Energy Independence and Security Act
- EPA:
-
Environmental Protection Agency
- EU:
-
European Union
- FAPRI-CARD:
-
Food and Agricultural Policy Research Institute—Center for Agricultural and Rural Development
- FASOM:
-
Forestry and agricultural sector optimization model
- FQD:
-
Fuel quality directive
- GHG:
-
Greenhouse gas
- GREET:
-
Greenhouse gases, regulated emissions, and energy use in tranpsortation
- GTAP:
-
Global trade analysis project
- HWP:
-
Harvested wood product
- ICONE:
-
Institute for international trade negotiations
- IEA:
-
International energy agency
- IFPRI:
-
International Food Policy Research Institute
- IIASA:
-
International Institute for Applied Systems Analysis
- iLUC:
-
Indirect land use change
- IPCC:
-
Intergovernmental panel on climate change
- LCA:
-
Life-cycle analysis
- LCFS:
-
Low-carbon fuel standard
- iLUC:
-
Land use change
- NCASI:
-
National Council for Air and Stream Improvement
- PE:
-
Partial equilibrium
- PTW:
-
Pump-to-wheels
- RED:
-
Renewable energy directive
- RFS2:
-
Renewable fuel standard
- RTFO:
-
Renewable transport fuels obligation
- SOC:
-
Soil organic carbon
- SOM:
-
Soil organic matter
- SRWC:
-
Short rotation woody crops
- UK:
-
United Kingdom
- UNICA:
-
Brazilian Sugarcane Industry Association
- USDA:
-
United States Department of Agriculture
- WTP:
-
Well-to-pump
- WTW:
-
Well-to-wheels
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This work is supported by the U.S. Department of Energy, Basic Energy Sciences, Office of Science, under contract # DE-AC02-06CH11357.
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Dunn, J.B., Han, J., Seabra, J., Wang, M. (2017). Biofuel Life-Cycle Analysis. In: Khanna, M., Zilberman, D. (eds) Handbook of Bioenergy Economics and Policy: Volume II. Natural Resource Management and Policy, vol 40. Springer, New York, NY. https://doi.org/10.1007/978-1-4939-6906-7_6
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