@roger,
Brazil recognized ethanol based on sugar cane as beneficial in the 70's. Wise decision for Brazil. Unfortunately corn is not sugar cane--corn requires fertilizer and intensive cultivation both of which requires petroleum.
I've heard it said that 5 gallons of ethanol from corn needs 4 gallons of petroleum to produce--not a good return when compared to sugar cane, sugar beets, sorghum, or switch grass.
Rap