| http://www.w3.org/ns/prov#value | - The system works!This article helpfully goes on to explain (for those who came in late) that the demand for ethanol is increasing, but that there is some debate over its energy efficiency.Proponents claim that ethanol - made mostly from corn - is a cost-effective, cleaner-burning fuel that lessens the need to import petroleum.Opponents say ethanol takes more energy to produce than it yields, lessen
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