Did you know? A bicycle is a marvel of engineering efficiency, one where an investment in 22 pounds of metal and rubber boosts the efficiency of an individual mobility by a factor of three. On my bike I estimate that I get easily 7 miles per potato. For more information view the text and data in Chapter 6 of Plan B 4.0: Mobilizing to Save Civilization.
Lester Brown talk on Plan B: Rescuing a Planet Under Stress & a Civilization in Trouble at Environment Canada Policy Research seminar series. French translation. [Note: http://www.ec.gc.ca/seminar/Brown_e.html no longer exists.]