Global ethanol production rose 25% from 2004 to 13.5 billion gallons last year, and biodiesel capacity more than doubled to 6.1 million metric tons in that period, though the two combined still only make up about 1% of the world’s transportation-fuel supply. Source: Patrick Barta, “Biofuel Costs Hurt Efforts to Cut Oil Price,” Wall Street Journal, November 5, 2007, page A2.