Los Angeles news online: L.A. mayor, Latino activists take on oil companies over Proposition 23 L.A. mayor, Latino activists take on oil companies over Proposition 23 ================================================================================ politics on 01/09/2010 07:00:00 They say the ballot initiative to suspend the state's climate change law would hurt low-income communities already suffering the most from pollution. Mayor Antonio Villaraigosa on Tuesday rebuked Valero Energy Corp. and Tesoro Corp., which operate refineries in Wilmington, for bankrolling a measure that would effectively scuttle the state's efforts to curb greenhouse gas emissions.