Firm attorneys Sarah M. Keane and Samantha R. Caravello published an article in the Summer 2019 issue of the American Bar Association’s Natural Resources & Environment journal regarding Colorado’s adoption of California’s greenhouse gas (GHG) emission standards for passenger cars and light trucks. The article provides an overview of the relevant federal and California vehicle emission standards, describes the process by which Colorado adopted California’s standards, and highlights the benefits of Colorado’s adoption of the standards, including cleaner air and substantial cost savings for consumers. The article concludes by considering Colorado’s regional and national role in progressing regulations and policies designed to reduce GHG emissions.