On February 26, 2007, the governors of five western states established the Western Regional Climate Action Initiative (the Initiative), agreeing “to collaborate in identifying, evaluating and implementing ways to reduce GHG [greenhouse gas] emissions in our states collectively and to achieve related co-benefits.” By August 2007, the participating states and provinces aim to set an overall regional goal to collectively reduce emissions. By August 2008, the initiative plans to develop a design for a regional market-based multi-sector mechanism, such as a load-based capand- trade program, to achieve the regional GHG reduction goal. The initiative will also participate in a multi-state GHG registry to enable tracking, management, and crediting for GHG emissions. Finally, the initiative committed to continue their independent and collaborative efforts to reduce GHG emissions through promoting the development and use of clean and renewable energy, increasing the efficiency of energy use, and advocating regional and national climate policies that reflect the needs and interests of western states.