| http://www.w3.org/ns/prov#value | - 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.Such a labeling system would reveal, for example, that a fuel such as ethanol varies widely in its environmental merit depending on its production history, according to co-author Michael O'Hare, UC Berkeley professor of public policy.
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