Century City and downtown Los Angeles are seen through the smog in this December 31, 2007 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: ENVIRONMENT SOCIETY) Published: Lis. 14, 2012, 5:43 odp.
Foto: Reuters
