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In addition the food supply issue that seems to plague the ethanol debate, there is more importantly the issue of renewable fresh water, which depending on whose projections you follow, has just a short a life span as fossil fuels.
Any fuel, like ethanol, that is based on fresh water requirements is not a viable alternative to fossil fuels and should not be looked at as a future source of energy. Factor in the food issue, the destruction of farmable land that corn can cause, and the less known studies that show that ethanol may create more CO2 emissions then gas. (Found one in the US Department of Transportation that was a study on why biodiesel should be used, it pointed this out) and I think the conclusion is ethanol is not, and should not be around much longer.
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