City buses turn to sewage for 'clean' fuel

Can the key to "clean" energy be found down in the sewer? That's the idea in Oslo, where city officials soon plan to introduce buses that run on biofuels extracted from human waste.

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<p><a href="http://www.physorg.com/news156914737.html">City buses turn to sewage for 'clean' fuel</a></p> <p>Can the key to "clean" energy be found down in the sewer? That's the idea in Oslo, where city officials soon plan to introduce buses that run on biofuels extracted from human waste.</p>