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The pace of technology improvement and deployment could significantly reduce the cost of stabilizing greenhouse gas concentrations and improve the nation's energy security. Given the need for a large-scale energy transformation, the challenge is to move toward actions that go beyond technology R&D to strategies that target the rapid and large-scale absorption of clean energy technologies into the economy. However, there are numerous barriers to the commercialization and deployment of technology innovations; those that are imposed by administrators, legislatures, and regulators are particularly of interest as they operate at cross-purposes with the U.S. government's GHG reduction goals. This talk focuses on these public policy issues, particularly the challenges of scale and sustainability.&'