MONTREAL - Clamping down on automobile emissions and plugging city buildings into wind or solar power, U.S. governors and mayors are stepping in to help head off climate change where they say the federal government is failing. "Together we can make a huge difference," Seattle Mayor Greg Nickels said Thursday as he and other U.S. city executives worked the corridors of the U.N. climate conference in Montreal. They said they hoped to spur the Bush administration to take the lead. But although federal action is needed, "we cannot afford to wait for federal action," said K.C. Golden, an environmental consultant...