Negotiations on the Kyoto Protocol to the United Nations Framework Convention on Climate Change (UNFCCC) was completed on December 11, 1997, committing the industrialized nations to specified, legally binding reductions in emissions of six “greenhouse gases.” The Protocol entered into force on February 16, 2005, and its emissions reduction requirements are binding on the 35 industrialized countries that have ratified it; the United States disengaged from the Protocol in 2001 and has not ratified it.

Climate change and greenhouse gas (GHG) emissions are a continuing issue in the 109th Congress. Bills directly addressing climate change issues range from those focused primarily on climate change research to comprehensive emissions cap-and-trade programs. Additional bills focus on GHG reporting and registries, or on power plant emissions of carbon dioxide, as part of wider controls on pollutant emissions. The bills vary in their approaches to climate change issues. This report briefly discusses the basic concepts on which these bills are based and compares major provisions of the bills in each of the following categories: climate change research, technology deployment, GHG reporting and registries, and emissions reduction programs.