Actually there is a significant amount of waste even from switchgrass ethanol production:

Lignin and protein, two important co-products, have the potential to significantly improve the economics of biorefineries. Lignin is a non-fermentable residue from the hydrolysis process. It has an energy content similar to coal and is employed to power the operation, thereby reducing production costs. "There is enough residue [lignin] left over to meet the energy needs of the process plus make additional ethanol or electricity," says Eric Larson, a research engineer at the Princeton Environmental Institute.

Cellulosic Ethanol.

It seems that every discussion I've seen on the environment is a 'pick one technology over the other' argument. There is no one 'silver bullet' technology to our environmental or efficiency problems.

Why can't we take a measured approach that includes both technologies?

In this case, the study completely ignored the possibility of using an acre of switchgrass as an ethanol feedstock and then using the resulting 'waste' as a fuel to produce electricity.

As another example, what about harvesting corn as a foodstock, then using the leftover stover as an ethanol feedstock and finally using whatever is left for electricity generation?

Am I the only one who sees the synergestic possibilities?