Hydrogen Pathways Program
Delucchi, Mark A. (2004) Conceptual and Methodological Issues in Lifecycle Analyses of Transportation Fuels. Institute of Transportation Studies, University of California, Davis, Research Report UCD-ITS-RR-04-45
In the United States and worldwide, the transportation sector is one of the largest sources of urban air pollutants and greenhouse-gases (GHGs). As a result, policy makers and analysts often evaluate the impact of transportation policies on urban air quality and on global climate. The tools available for evaluating impacts on urban air quality (emission-factor models, travel models, and air-quality models) are reasonably well developed, but some of the tools for evaluating impacts on global climate (namely, lifecycle emissions models) are rudimentary and incomplete. This paper discusses some of the methodological and data issues pertinent to using lifecycle analysis (LCA) to evaluate the impacts of transportation on global climate.