The Regional Greenhouse Gas Initiative (RGGI) is a consortium of Northeastern U.S. states that limit carbon dioxide emissions from electricity generation through a regional emissions trading program. Since RGGI started in 2009, regional emissions have sharply dropped. We use econometric models...

Construction codes that regulate the energy efficiency of new buildings have been a centerpiece of US environmental policy for 40 years. California enacted the nation's first energy building codes in 1978, and they were projected to reduce residential energy use--and associated pollution--by 80...

Starting in the 1970s California's residential electricity consumption per capita stopped increasing, while other states' electricity use continued to grow steadily. Similar patterns can be seen in non-electric energy, industry, and transportation. What accounts for California's apparent energy...