Senators John McCain (R-Ariz.) and Joe Lieberman (D-Conn.) have introduced a bill (S. 139) that would create a mandatory cap on greenhouse gas emissions, beginning in 2010. Proponents of the bill argue that cuts in carbon dioxide are necessary to prevent global warming. Most of the scientific community believes that such modest reductions in carbon dioxide emissions will have little measurable effect on the climate. A new cost analysis by Charles River Associates conducted for the Tech Central Science Foundation argues that the cost to families and the impact on the American economy of the McCain-Lieberman bill would be much more dramatic than earlier projections. Anne E. Smith of Charles River Associates, William A. Pizer, a fellow at Resources for the Future, and AEI's Samuel Thernstrom will discuss the study at this breakfast panel.