He has authored over 100 technical papers and a number of books on energy economics, environment and transportation around the world. Previously, he was Director of Research for EMBARQ, the World Resources Institute (WRI) Center for Sustainable Transport, which he helped found in April 2002. The views he expresses here are solely personal.

He has authored over 100 technical papers and a number of books on energy economics, environment and transportation around the world. Previously, he was Director of Research for EMBARQ, the World Resources Institute (WRI) Center for Sustainable Transport, which he helped found in April 2002. The views he expresses here are solely personal.

"There are only so many minutes and miles in a day that people will travel," Schipper explained in an interview on the Stanford campus. Schipper, former director of research for the World Resources Institute's Center for Sustainable Transport (known as EMBARQ), believes higher fuel prices play only a part in what is happening.

"There are only so many minutes and miles in a day that people will travel," Schipper explained in an interview on the Stanford campus. Schipper, former director of research for the World Resources Institute's Center for Sustainable Transport (known as EMBARQ), believes higher fuel prices play only a part in what is happening.