FrontMatter -- Preface -- Contents -- 1 Introduction -- 2 Uses and Abuses of Marginal Abatement Supply Curves -- 3 Uses and Abuses of Learning, Experience, and Knowledge Curves -- 4 Offsets-What's Assumed, What Is Known/Not Known, and What Difference They Make -- 5 Story Lines, Scenarios, and the Limits of Long-Term Socio-Techno-Economic Forecasting -- 6 Reflections on the Workshop -- References -- Appendixes -- Appendix A: Workshop Announcement and Agenda -- Appendix B: Biographical Sketches of Planning Committee Members, Speakers, and Discussants -- Appendix C: Papers Submitted by Workshop Speakers -- Paradigms of Energy Efficiency's Cost and Their Policy Implications: Déjà Vu All Over Again--Mark Jaccard -- Energy Efficiency Cost Curves: Empirical Insights for Energy-Climate Modeling--Jayant Sathaye and Amol Phadke -- The Perils of the Learning Model For Modeling Endogenous Technological Change--William D. Nordhaus -- Uncertainties in Technology Experience Curves for Energy-Economic Models--Sonia Yeh and Edward Rubin -- Role of Offsets in Global and Domestic Climate Policy--Raymond J. Kopp -- Carbon Offsets in Forest and Land Use--Brent Sohngen -- Measurement and Monitoring of Forests in Climate Policy Design--Molly K. Macauley -- International Offsets Usage in Proposed U.S. Climate Change Legislation--Allen A. Fawcett -- The Politics and Economics of International Carbon Offsets--David G. Victor -- Developing Narratives for Next-Generation Scenarios Climate Change Research and Assessment--Richard Moss.