The Southern California region contains over 44% of California's population and is home to Los Angeles County and surrounding counties. Los Angeles County alone contains over 10 million residents, making it more populous than all but 9 U.S. states. As of 2009, building energy use and employee commutes accounted for the majority of Los Angeles County's municipal greenhouse gas emissions at 35% and 33% respectively. Looking ahead to 2020, emissions are forecasted to rise across all sectors if no additional actions are taken.