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Two things happening already: land that can feed local people is controlled by biofuel companies, and the global price of grain goes up as it becomes valued as fuel.
http://www.theguardian.com/environment/2014/jun/27/land-grabbing-food-biofuels-crops
https://www.actionaid.org.uk/food-not-fuel/real-lives-affected-by-biofuels
http://content.time.com/time/health/article/0,8599,2048885,00.html
hoefla
As for cars powered by old chip fat, it's not that energy efficient though is it?
The concept of growing planet scale amounts of food just to burn and not to eat makes me think of a larger, more lethal, potato famine waiting to happen.