Most Energy-Efficient Form of Travel Ever Devised : TreeHugger

Most Energy-Efficient Form of Travel Ever Devised : TreeHugger:

"“The bicycle—the most energy-efficient form of travel ever devised—deserves better. Pound for pound, a person on a bicycle expends less energy than any creature or machine covering the same distance. (A human walking spends about three times as much energy per pound; even a salmon swimming spends about twice as much.)”"