The buildings sector is the largest source of global warming pollution in the United States, including emissions from generating the electricity used in buildings. Buildings and the appliances within them currently account for roughly one-third of U.S. greenhouse gas (GHG) emissions, and that number is on the rise. Fortunately, buildings also offer the quickest and most cost-effective opportunity to reduce global warming pollution while yielding direct economic benefits, saving consumers money and boosting U.S. industry. Energy efficiency measures such as retrofitting existing buildings and increasing the energy efficiency of new buildings can generate net savings using technology that exists today. NRDC recommends a clear set of policy solutions for reaping the immediate benefits of building efficiency.