I don't think it's right to categorically dismiss biofuels all together, but the current ethanol-based approach was a bad idea and needs to be abandoned now. There are much higher-yield biofuel sources out there already, with some interesting technologies (such as algae biofuel farms) on the horizon.
The focus of the biofuel movement should be to provide a viable alternative fuel supply in parts of the world where fuel prices prohibit modernized farming methods; as part of a modernization effort, biofuels could actually help increase the global food supply. The difficult balance is that the innovation needs to come from developed countries, but makes sense as a crop only in developing countries.
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