Preface. List of Participants. Part 1: Model Validation: How Good are the Models in Simulating the Present and Past Climates? A Statistical Intercomparison of Temperature and Precipitation Predicted by Four General Circulation Models (S.L. Grotch). Comparing and Contrasting Holocene and Eemian Warm Periods with Greenhouse-Gas-Induced Warming (M.C. MacCracken, J. Kutzbach). Utilization of Paleoclimate Results to Validate Projections of a Future Greenhouse Warming (T.J. Crowley). Part 2: Climate Model Projections of Greenhouse-Gas-Induced Equilibrium Climatic Change: What Are the Expected Climatic Changes? The Equilibrium Response to Doubling Atmospheric CO2 (J.F.B. Mitchell).Computer Experiments with a Coarse-Grid Hydrodynamic Climate Model (G.L. Stenchikov). Climate Variability and Climate Change (D. Rind). Characteristics of Coupled Atmosphere-Ocean CO2 Sensitivity Experiments With Different Ocean Formulations (W.M. Washington, G.A. Meehl). The Southern Oscillation in a Coupled GCM: Implications for Climate Sensitivity and Climate Change (G.A. Meehl). Climatic Response to a Gradual Increase of Atmospheric Carbon Dioxide (R.J. Stouffer, S. Manabe, K. Bryan). Part 3: Observations of Climate Circa 1850 to the Present: has the Climate Changed? Marine and Land Temperature Data Sets: A Comparison and a Look at Recent Trends (P.D. Jones, T.M.L. Wigley, G. Farmer). Worldwide Surface Temperature Trends Since the Mid-19th Century (D.E. Parker, C.K. Folland). Climate Trends, The U.S. Drought of 1988, and Access to Data (R. Jenne). Regional Greenhouse Climate Effects (J. Hansen, et al.). Changes in Tropospheric and Stratospheric Global Temperatures, 1958-1988 (J.K. Angell). Representativeness of a 63-Station Network for Depicting Climate Changes (K.E. Trenberth, J.G. Olson). Soil Moisture Content with Global Warming (K. Ya. Vinnikov). Some Characteristics of Wet and Dry Regimes in the Contiguous United States: Implications for Climate Change Detection Efforts (H.F. Diaz). Data on Present Day Precipitation Changes in the Extratropical Part of the Northern Hemisphere (P. Ya. Groisman). Monitoring Tropospheric Water Vapor Changes Using Radiosonde Data (W.P. Elliott, M.E. Smith, J.K. Angell). Observational Evidence of Changes in Global Snow and Ice Cover (R.G. Barry). Observations of Long-Term Tide-Gauge Records for Indications of Accelerated Sea-Level Rise (V. Gornitz, A. Solow). The Southern Oscillation and Northern Hemisphere Temperature Variability (C.F. Ropelewski, M.S. Halpert). Recent Climate Changes in the Northern Hemisphere (K.E. Trenberth). Pre-Instrumental Climate: How Has Climate Varied During the Past 500 Years?? (R.S. Bradley). Part 4: Forcing Other Than by Greenhouse Gases: What Has Caused the Variations in the Observed Climatic Record. The Effects of Solar Variability on Climate (M.I. Hoffert). The Volcanic Contribution to Climate Change of the Past 100 Years (A. Robock). Chaos, Spontaneous Climatic Variations and Detection of the Greenhouse Effect (E.N. Lorenz). Part 5: Comparison of Model Simulations and Observations: Has a Greenhouse-Gas-Induced Climatic Change Been Detected? Natural Climate Variability in a Coupled Model (S.E. Zebiak, M.A. Cane). Internally Generated Natural Variability of Global-Mean Temperatures (T.M.L. Wigley, S.C.B. Raper). Multivariate Statistical Assessments of Greenhouse-Gas-Induced Climatic Change and Comparison with Results from General Circulation Models (C.-D. Schönwiese). On the Statistical Comparison of Climate Model Output and Climate Data (A.R. Solow). Multivariate Methods for the Detection of Greenhouse-Gas-Induced Climatic Change (B.D. Santer, et al.). On Greenhouse Gas Signal Detection Strategies (T.P. Barnett, M.E. Schlesinger, X. Jiang). An Attempt to Detect the Greenhouse-Gas Signal in a Transient GCM Simulation (T.P. Barnett). Part 6: Working Group Reports. 1. Observations (K. Trenberth, et al.). 2. A Critical Appraisal of Model Simulations (M. MacCracken, et al.). 3. Greenhouse Signal Detection (T. Barnett, et al.). Index.