That San Francisco is trying to use biodiesel in many city fleet vehicles is no secret (see links below). From emergency vehicles to buses, the city is looking to turn veggie oil into fuel all over the place, even in paintings. All SF's forward-thinking resulted in a little shout-out in a large mural (12 by 38 feet) by Mona Caron on a building at 300 Church Street and 15th Street. The mural was painted in 2004, and you can read all you'd ever wanted to know about it here.

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[Source: San Francisco Biofuels]

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