S**t hits the fan(belt): manure, sewage as biofuel materials

arstechnica.com
By John Timmer Last updated: 5/24/10

If you look at any single source of biofuels, the numbers can seem depressing, as it's very difficult to obtain enough raw material to account for more than a small percentage of the United States' liquid fuel use. The good news is that it's possible to feed a variety of raw materials into a limited number of outputs, such as bioethanol and biodiesel, meaning that a portfolio approach that combines multiple sources of biofuels may actually be able to put a dent in our fossil fuel consumption. A couple of recent articles have taken a look at one very promising source of raw materials: waste that we have a tough time disposing of in the first place.

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