Spatially-Explicit Life Cycle Assessment of Sun-to-Wheels Transportation Pathways in the US

被引:26
作者
Geyer, Roland [1 ]
Stoms, David [1 ]
Kallaos, James [2 ]
机构
[1] Univ Calif Santa Barbara, Bren Sch Environm Sci & Management, Santa Barbara, CA 93106 USA
[2] Norwegian Univ Sci & Technol, Dept Civil & Transport Engn, N-7491 Trondheim, Norway
基金
美国国家科学基金会;
关键词
GREENHOUSE-GAS EMISSIONS; LAND-USE; CLIMATE-CHANGE; IMPACTS; ETHANOL; ENERGY; BIOFUELS; SWITCHGRASS;
D O I
10.1021/es302959h
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Growth in biofuel production, which is meant to reduce greenhouse gas (GHG) emissions and fossil energy demand, is increasingly seen as a threat to food supply and natural habitats. Using photovoltaics (PV) to directly convert solar radiation into electricity for battery electric vehicles (BEVs) is an alternative to photosynthesis, which suffers from a very low energy conversion efficiency. Assessments need to be spatially explicit, since solar insolation and crop yields vary widely between locations. This paper therefore compares direct land use, life cycle GHG emissions and fossil fuel requirements of five different sun-to-wheels conversion pathways for every county in the contiguous U.S.: Ethanol from corn or switchgrass for internal combustion vehicles (ICVs), electricity from corn or switchgrass for BEVs, and PV electricity for BEVs. Even the most land-use efficient biomass-based pathway (i.e., switchgrass bioelectricity in U.S. counties with hypothetical crop yields of over 24 tonnes/ha) requires 29 times more land than the PV-based alternative in the same locations. PV BEV systems also have the lowest life cycle GHG emissions throughout the U.S. and the lowest fossil fuel inputs, except for locations with hypothetical switchgrass yields of 16 or more tonnes/ha. Including indirect land use effects further strengthens the case for PV.
引用
收藏
页码:1170 / 1176
页数:7
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