Statewide Greenhouse Gas Cap – A statewide greenhouse gas (GHG) cap is a comprehensive, regulatory commitment to reduce statewide GHG emissions to a specified level during a certain timeframe (e.g., 1990 levels by 2020). Such an approach can include adopting regulations to require GHG emission reporting and verification, and establishing authority for monitoring and enforcing compliance with the program. An emission cap can be combined with emission trading into a “cap and trade” program.