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In his State of the Union address, President Bush once again sounded the alarm about America’s dependence on foreign oil, and he called for a reduction in gasoline consumption by 20 percent over the next 10 years. But Bush framed the issue largely as a national security concern: dependence on foreign oil leaves the U.S. vulnerable to hostile regimes and to terrorists who can harm our economy by disrupting the flow of oil. He said little about the environmental need to conserve resources and reduce planet-heating greenhouse gases.