eats energy too...
Hi Tom
Biodiesel is like ethanol - unless they're by-products of some other process by themselves the net energy balance is slightly in the negative and so some fossil fuel input is needed - they're energy "savers" not net energy sources - at least, in the case of ethanol, until someone can find a handy way of breaking cellulose down into sugars. Biodiesel from meat-processing wastes is a good idea, but deliberately growing oil-seed crops won't work.
Adam