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Ethanol industry turns to plant residue, scraps

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DES MOINES, Iowa (AP) — Ethanol producers have talked for decades about using plant residue, wood scraps and even garbage to produce the fuel additive, but now companies finally are building full-scale refineries. About 70 cellulosic ethanol projects are under way, reflecting billions of dollars of private investment. The breakthrough comes at a key time, after the drought heightened...