by 
Metaphiz
ANSWERS: 1
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Consider this, Why use corn at all? Research shows native prairie grasses are much more efficient in producing ethanol than corn. It takes 1 gallon of fossil fuels (in the form of fertilizer, tractor fuel, ethanol plant operation, etc.) to produce 1.2 gallons of ethanol from corn. Yet research has shown that 1 gallon of fossil fuel can produce over 5 gallons of ethanol from prairie grasses, according to Terry Riley, President of Policy at the Theodore Roosevelt Conservation Partnership. So, if the whole reason for ethanol production is to relieve our dependence on oil and reduce the production of greenhouse gasses, then native prairie grasses are the way to go.
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