Energy Efficiency, vol. 2, issue 2 (2009) pp. 125-137
Abstract A key message of the Fourth Assessment Report (AR4) of the Intergovernmental Panel on Climate Change is that improved energy
efficiency is one of society’s most important instruments for combating climate change. This article reviews a range of energy
efficiency measures in the transportation sector as discussed in AR4 and assess their potentials for improving fuel efficiency.
The primary focus is on light-duty vehicles because they represent the largest portion of world transport energy use and carbon
dioxide emissions; freight trucks, a rapidly expanding source of greenhouse emissions, are also discussed. Increasing energy
efficiency can be achieved by improving the design and technology used in new vehicles, but vehicle technology is only one
component of fleet fuel economy. Measures that create strong incentives for customers to take energy efficiency into consideration
when buying and operating their vehicles will be crucial to policy success.
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