March 2012
Intermediate to advanced
272 pages
6h 50m
English

The fuel of the future is going to come from fruit like that sumac out by the road or from apples, weeds, sawdust—almost anything. There is fuel in every bit of vegetable matter that can be fermented. There's enough alcohol in one year's yield of an acre of potatoes to drive the machinery necessary to cultivate the fields for a hundred years.
—Henry Ford, 1925
Henry Ford may have been a bit ahead of his time, but he was right about one thing: the energy of the future will have to come increasingly from renewable energy. Over the past 250 years, humans have consumed an ever-increasing amount ...