On May 8, 2007, more than 30 states signed on as charter members of The Climate Registry, a collaboration aimed at developing a common system for entities to report greenhouse gas emissions. The Registry will serve as a tool to measure, track, verify and publicly report greenhouse gas emissions consistently and transparently between states. Voluntary, market-based and regulatory greenhouse gas emissions reporting programs are all supported under the Registry. The founding member states and tribes include: Arizona, California, Colorado, Connecticut, Delaware, Florida, Hawaii, Illinois, Kansas, Maine, Maryland, Massachusetts, Michigan, Minnesota, Missouri, Montana, New Hampshire, New Jersey, New Mexico, New York, North Carolina, Ohio, Oregon, Pennsylvania, Rhode Island, South Carolina, Utah, Vermont, Washington, Wisconsin, Wyoming and the Campo Kumeyaay Nation. The Canadian provinces of British Columbia and Manitoba have also joined the Registry. This collaboration is the largest national effort to date to track greenhouse gas emissions.
Climate Registry Website
Map of States with Greenhouse Gas Reporting and Registries