A dump wagon adds freshly gathered corn cobs to a pile on a farm near Hurley, S.D., in this 2007 file photo. After decades of talk, the ethanol industry is building multimillion-dollar refineries in several states that will use corn plant residue, wood scraps and even garbage to produce the fuel additive. Associated Press photo
Read the article: Ethanol industry turns to plant residue, wood scraps and garbage
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