text: The General Accounting Office has analyzed the stark difference between the two studies and concluded that there are two principal reasons for it. First, the Bush Administration's estimate assumed that all reductions would be achieved domestically, while the Clinton Administration's estimate assumed that compliance would be largely achieved through the purchase of emissions reductions from other nations. Second, the economic growth rate assumed by the Bush study (2.3 percent a year for 1995 through 2010) was higher than the growth rate assumed by the Clinton study (2.1 percent for the same time period), and thus forecast a higher level of emissions. (GAO report, January 30, 2004).