Posted at 3:09 PM on 07 Mar 2008 San Francisco Mayor Gavin Newsom got jiggy with eco-measures this week. He signed into a law a requirement that the city's taxi fleet be converted to low-emission vehicles by 2011; ordered all city departments to purchase 100 percent recycled paper and reduce overall paper use by 20 percent by 2010; and announced his support for a tidal-energy project in the San Francisco Bay, despite a recent ...