The following analysis traces U.S. transport CO₂ emissions in combustion by mode for 1960–2008. Changes in emissions are divided into components related to overall population and economic growth, transport mode shift, changes in the ratio of fuel used to passenger or tonne-km of activity, and...

“Sustainable Transportation: The Future of the Automobile in an Environmentally Constrained World†has analyzed the nature of the problems confronting the transportation systems of industrialized countries. We seek to understand how travel and energy use for travel (and freight) is...

This paper examines two major emerging constraints on transport in fast-growing Chinese urban cities: oil supply and urban infrastructure. The research considers automobile technology, alternative fuels, and mobility choices, as well as policy measures that could be adopted to reduce the use of...

A review of recently available data on both on-road fuel economy and new car test fuel economy shows that while US on-road fuel economy has been flat for almost 15 years, major European countries and Japan have shown modest improvements in response to “voluntary†agreements on fuel...

We examine energy efficiency in the Japanese transportation sector since the 1970s. Comparisons with the United States and other developed economies illustrate that Japan primarily stands out due to low activity levels and modal structure rather than modal energy intensity. On-road automobile...