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TRANSPORTATION FUELS (2) answer(s).
 
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ID:   150723


Leveling the playing field of transportation fuels: accounting for indirect emissions of natural gas / Sexton, Steven; Eyer, Jonathan   Journal Article
Sexton, Steven Journal Article
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Summary/Abstract Natural gas transportation fuels are credited in prior studies with greenhouse gas emissions savings relative to petroleum-based fuels and relative to the total emissions of biofuels. These analyses, however, overlook a source of potentially large indirect emissions from natural gas transportation fuels, namely the emissions from incremental coal-fired generation caused by price-induced substitutions away from natural-gas-fired electricity generation. Because coal-fired generation emits substantially more greenhouse gases and criteria air pollutants than natural-gas-fired generation, this indirect coal-use change effect diminishes potential emissions savings from natural gas transportation fuels. Estimates from a parameterized multi-market model suggest the indirect coal-use change effect rivals in magnitude the indirect land-use change effect of biofuels and renders natural gas fuels as carbon intensive as petroleum fuels.
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2
ID:   111342


Status of advanced light-duty transportation technologies in th / Andress, David; Das, Sujit; Joseck, Fred; Nguyen, T Dean   Journal Article
Andress, David Journal Article
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Publication 2012.
Summary/Abstract The need to reduce oil consumption and greenhouse gases is driving a fundamental change toward more efficient, advanced vehicles, and fuels in the transportation sector. The paper reviews the current status of light duty vehicles in the US and discusses policies to improve fuel efficiency, advanced electric drives, and sustainable cellulosic biofuels. The paper describes the cost, technical, infrastructure, and market barriers for alternative technologies, i.e., advanced biofuels and light-duty vehicles, including diesel vehicles, natural-gas vehicles, hybrid electric vehicles, plug-in hybrid electric vehicles, and fuel-cell electric vehicles. The paper also presents R&D targets and technology validation programs of the US government.
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