ethanol
Learning is easy. Getting it right is harder. Expunging falsehoods is hardest, but most rewarding.
There is a "meme" (using the definition of a meme as something most people in a certain community think whether it is true or not) that to produce one gallon of Ethanol for fuel you have to use some larger number (I've heard two, and I've heard five) gallons of gasoline.
In an ideal world there would be farms with giant solar collectors and wind generators. These devices would produce electricity to run distilling machines and hybrid tractors and such. On the farm would be grown GMO plants…