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A new study by the University of Nebraska's Kenneth Vogel has shown that switchgrass, a prairie grass found alongside the borders of many fields, yields 540% more energy than is used to grow it.
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That impressive 540% figure compares quite favorably to the 93% return on soybean biodiesel and (measly) 25% return on corn ethanol. Emissions produced from using switchgrass bioethanol would be roughly 94% lower than those from gasoline - making it almost carbon neutral