Biodiesel: Even Better Than We Thought
A widely cited 1998 life cycle study by the U.S. Department of Energy and the Department of Agriculture concluded that "Biodiesel yields 3.2 units of fuel product energy for every unit of fossil energy consumed in its life cycle" while "petroleum diesel yielded only 0.83 units of energy per unit of fossil energy consumed". Time for an update: A soon to be published 2007 study by the USDA and the University of Idaho finds that the energy balance of biodiesel is "a positive ratio of 3.5-to-1". What has changed? Was the first study wrong?... (more)
via:treehugger
