I'd like to get your opinion (based on solid, well-sourced information) about how realistic it is that rapid development of America's biofuels infrastructure (ethanol, biodiesel, etc.) can have a significant positive impact on helping to free us from dependence on foreign oil as soon as possible.
Even if just as a transitional energy source.
Folks like David Pimentel at Cornell say biofuels, especially corn-based ethanol, take more energy to produce than they will save us. Is this true and is there a way around this problem? Are any particular crops, or perhaps some kind of weedy, low-input grass, better candidates than corn or soy for mass production of biofuels?
Another criticism of biofuels is that reliance on them will be a threat to our food supply, as valuable food crops will be diverted to meet our energy needs. How accurate is this?
I'm looking forward to whatever information you can provide about whether and how biofuels can simultaneously help us quickly (over the next decade) achieve freedom from foreign oil, boost our national security, reduce our greenhouse gas emissions, and save consumers and businesses money.