A fleet of fuel-efficient taxis on the streets of San Francisco have reduced gas consumption in the city by 2.9 million gallons per year and lowered greenhouse gas emissions by 35,000 tons annually, the equivalent of taking 4,700 passenger cars off the road.
When Mayor Gavin Newsom sponsored a green taxi law in 2008 requiring San Francisco cab companies to lower their greenhouse gas emissions 20 percent below 1990 levels by 2012, many said the goal was impossible to achieve. But flanked by a collection of green cabs in front of City Hall on Monday, Newsom announced that 55 percent of the city's taxis are now being run on alternative fuels including hybrids and compressed natural gas.
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