This site is an archive of past WCI materials and is no longer being updated. For the latest information related to implementation of the state and provincial greenhouse gas emissions trading programs, please visit

Welcome to the Western Climate Initiative (WCI). The WCI is a collaboration of independent jurisdictions working together to identify, evaluate, and implement emissions trading policies to tackle climate change at a regional level. This is a comprehensive effort to reduce greenhouse gas pollution, spur investment in clean-energy technologies that create green jobs and reduce dependence on imported oil.

Follow the links above to learn more about the WCI program design and to access WCI news and documents.