DAVID NUNUK / SCIENCE PHOTO LIBRARY DAVID NUNUK / SCIENCE PHOTO LIBRARY
Corn ethanol processing plant, Shenandoah, Iowa, USA. Corn ethanol is a biofuel that is primarily used in the United States as an alternative to gasoline and petroleum. It is produced from corn through industrial fermentation, processing and distillation. The processing plant shown is operated by Green Plains Renewable Energy.
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