The shale gas revolution in the United States has dropped the price of natural gas (NG) significantly. Combined with new fuel and vehicle technologies, an opportunity exists to expand the use of NG throughout the economy, including in the light-duty fleet of cars and trucks. This expansion could...

In many advanced economies, car use per head, and sometimes total car traffic, has shown low growth. In some countries (and especially cities) it has declined. In a few countries, there have been similar studies of the distance travelled by all modes added together, which has shown a similar...