Chart updated 28 February to take account of this comment from Profbaldwin.

The future of motor vehicles lies in improved efficiency and that is to the left of the gasoline ICE in the chart. That future is electric vehicles powered by high ERoEI renewable electricity.

Energy Controversies lecture series, University of Aberdeen, 5th February to 30th April 2009.

"We are set on a disastrous course. Governments must accept that the way we use energy must change and that a painful period of adjustment lies ahead. The energy efficiency of energy use and procurement should lie at the heart of decision-making and a good starting point is to ensure that reliable efficiency data is available to guide this process."

This is a guest post by Hans Noelder, a mechanical engineer and cofounder of the Madison Wisconsin Peak Oil Group. This is a link to Hans' blog, where this originally was posted.

Having recently traveled from my home near Madison, Wisconsin to Pontiac, Michigan using rail as much as possible (Metra commuter rail from Harvard, Illinois to Chicago and thence Amtrak to Pontiac) it is clear to me that investments in rail-based transportation could yield substantial environmental and social benefits in this region of the United States – primary among them a massive reduction in automobile-centric sprawl. The synergy between rail transit and dense, pedestrian-oriented urban habitat is especially clear in the Chicago heartland. Her leaders – God bless them! – never allowed their transit system to collapse, much less be systematically dismantled by transit-averse business interests.

However, I am troubled by the various claims I've seen over the years regarding energy consumption and CO2 emissions per passenger-mile for trains/streetcars versus automobiles versus airplanes.

When my talk to the Royal Society of Chemists was first arranged this summer, oil cost over $130 per barrel, and we wondered where the price would be in October. Since then much has happened. The credit expansion bubble was pricked in part by inflation stemming from high energy prices, and the global banking system is teetering on the brink of collapse, reprieved only by the spread of social ownership throughout the OECD.