Way back when I read The Hydrogen Economy, the author claimed something like 4 calorie investment for every calorie we pulled out of the ground for ethanol. I t

Way back when I read The Hydrogen Economy, the author claimed something like 4 calorie investment for every calorie we pulled out of the ground for ethanol. I think is more a criticism of the Nixon era green revolution, when large scale chemical fertilizers came into use, since these are largely petro chemical products.