LA Global Warming

**FILE**Traffic drives toward downtown Los Angeles on the 110 freeway as a curtain of smog shrouds the skyline, in this July 1998 file photo. The nation's smog capital is joining the broad fight against climate change. Los Angeles, a city devoted to cars and polluted by the exhaust that comes with them, announced Tuesday, May 15, 2007, an array of steps to sharply reduce greenhouse gases by 2030. (AP Photo/Nick Ut)