This recently updated publication provides an overview of climate-related efforts in the United States, including activity:

• In Congress, where in October 2003, the U.S. Senate for the first time voted on legislation that would cap U.S. greenhouse gas (GHG) emissions and establish a national GHG trading system;
• At the state level, where governments are enacting mandatory carbon controls and other programs that reduce GHG emissions;
• In the business community, where a growing number of corporations are setting GHG reduction targets and achieving significant emission reductions.