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Bio-Ethanol Ford

Photo: The hood of a Ford car running with bio-ethanol is seen during the second media day of the 77th Geneva Motor Show, in March, 2007

A Ford car proudly displays its clean technology credentials on media day at the 2007 Geneva Motor Show in Switzerland. Biodiesel is made from renewable sources like soybean oil, mustard seed oil, or waste vegetable oil, which are mixed with an alcohol and a catalyst.

Photograph by Fabrice Coffrini/Getty Images