(image from dvice.com)Sierra Nevada Brewing Company uses their waste products from beer production to produce ethanol. generally, the high alcohol content waste is used as cattle feed, but they have built mini-refineries to increase the alcohol content of the beer by-products to the point where it becomes viable ethanol, a cleaner burning automotive or motor fuel.
Interesting side note: the original model T Ford was built to run on pure ethanol. (the more you know...)
LINK to better article at WIRED
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