A farmer in Mozambique grows peas, beans and cassava in rotation--enough to feed the family with a little to spare. The farmer then sells that excess to CleanStar Mozambique, which dries and packages the produce for sale in the capital, Maputo. But the company also takes the surplus cassava , a starch-filled root and local food staple, and sends it to an ethanol fermentation plant built by ICM, a U.S. ethanol company, that employs enzymes produced by Denmark-based Novozymes. The ethanol produced is then sold in reusable plastic bottles to people in Maputo who own one of the 3,000 or so ethanol-burning clean cookstoves sold by CleanStar. When the fuel runs out, more can be purchased at an incipient network of CleanStar shops.
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