Photo: Alcohol, Feces, Carcasses Fuel "Green" Vehicles in Sweden

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"Amanda," thought to be the world's first biogas train, started chugging along the southeast coast of Sweden in 2005.

The pollution-free train is powered by biogas, a renewable fuel source formed by decomposing micro-bacteria that feed on substances such as alcohol, animal remains, and human waste.


Photograph courtesy Lasse Hejdenberg

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