The sun reflects on downtown skyscrapers as it sets through the Los Angeles smog and haze in this October 22, 2006 file photo. California is set to unveil a new weapon in its fight against global climate change November 14, 2012 when it holds its first sale of carbon emissions permits - a landmark experiment that it hopes will serve as a model for other U.S. states and the federal government. REUTERS/Lucy Nicholson/Files (UNITED STATES - Tags: CITYSPACE ENVIRONMENT TRAVEL)