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I think that a lot of empahsis has been placed on corn was to get the infrastructure off the ground. I am not a Chem Eng. but I would assume that converting a plant that makes ethanol from corn to a plant that makes ethanol from other sources is not a huge change or upgrade. I think the U.S. govt was/is trying to make conditions that when we figure out better sources for ethanol, the plants will be in place and the cars will be on the road already so the transition is a 1 year time frame instead of 10 years.
This is really why H2 cars will not take off, there is no infrastructure in place for people to buy the cars and nobody wants to build the infrastructure because there are no cars to use the fuel.
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