As we've seen on earlier threads, there's room for niche markets for biodiesel, making use of stuff like used frying oil from fast food restaurants and other waste products. But there's not much sense in replacing food crops with fuel crops, when our country is already starting to become a net importer of food.
That is certainly bad news. For most of the twentieth century we were net exporters of food on a large scale, but that is no longer true, apparently.
The problem with the environmental movement is that it becomes fixated on the latest chic fad. Then you get an unholy alliance between the environmental whackos and the corrupt politicians, pushing public tax money into factory farms owned by big political donors, for instance.
I'm all in favor of genuine innovation and discovery, but you have to take the politics out of it, and you have to be VERY careful of any program that involves huge government subsidies and bureaucracies, because then the vested interests take over and could care less whether the program is actually helpful or economically viable.