"Climate change and greenhouse gas (GHG) emissions were an issue in the 108th Congress, as they were over the preceding decade. Bills directly addressing climate change issues ranged from those focused primarily on climate change research (H.R. 1578 and S. 1164) to comprehensive emissions cap and trading programs for all six greenhouse gases (S. 139 and H.R. 4067). Additional bills focused on GHG reporting and registries (H.R. 6 (Senate-passed), H.R. 1245, S. 17, and S. 194), or on power plant emissions of carbon dioxide (H.R. 2042, S. 139, S. 366, and S. 843). These climate change bills differed within and across categories. Among the climate change research bills, there were common and divergent research focuses. For example, a few bills, including S. 139 and S. 1164, would have directed research on historical instances of climate change to develop climate change models. Additional bills focused on research to examine vulnerabilities to climate change in the United States, particularly with respect to human health, environmental, and economic outcomes. Furthermore, some bills would have promoted research on political and technological options to reduce GHG emissions. […] This report briefly discusses basic concepts on which these bills were based, and compares major provisions of the bills in each of the following categories: climate change research, GHG reporting and registries, and cap and trade programs. This report will not be updated."
CRS Report for Congress, RL32055
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