With all the confusion out there, this could certainly be useful:
The debate over whether biofuels like ethanol are better for the environment than fossil fuels has left many consumers confused and unsure where to fill their gas tanks.
Much of this confusion could be eliminated with a biofuels rating system that would reflect the positive or negative environmental impacts of a particular fuel, according to a group of University of California, Berkeley, researchers.
A ratings system, like the Michelin stars for hotels and restaurants, would take into account all environmental aspects of biofuels processing and production, from the way biofuel crops are tilled and fertilized to the kinds of energy — coal, natural gas or biomass, for example — used to process them.
Such a system would not only help consumers make decisions about where to fuel up but, perhaps more importantly, stimulate competition among fuel producers to market the greenest fuels possible, driving the less-green biofuels out of the marketplace in favor of ones that really serve the planet.