The mayors of Los Angeles and San Francisco have proposed highly ambitious efforts to become the greenest cities of all. In Los Angeles, Mayor Antonio Villaraigosa plans to reduce the city's greenhouse gas emissions to 35% below 1990 levels by 2030 and make L.A. the "cleanest and greenest city in the country," while San Francisco Mayor Gavin Newsom has a plan to cut greenhouse gases in that city to 20% below 1990 levels by 2012.

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