Let the grass grow!

We often hear debates about whether bio-ethanol production is taking the food out of other peoples’ mouths.

So how about growing crops especially for bio-ethanol production, that are not intended for human consumption.  Such as grass.

The grass in this report would not only be one possible solution, but researchers claim that it produces more energy than is required to make it.  In other words, it takes less CO2 to produce the bio-ethanol than the amount that is being saved, making an overall net reduction in CO2 – aparently 94% compared to the same volume of petrol.

I wonder what people will find wrong with this solution?