A special issue of Climatic Change (69:1, March 2005) is a comprehensive report of an integrated assessment of climate change recently completed by JGCRI. The performance of improved Integrated Assessment methodology is tested in an analysis of climate change impacts on the United States. Integrated Assessment is our framework for examining how greenhouse-gas induced changes in climate might affect agriculture and natural resources and, in turn, land-use patterns and economic welfare. This special issue contains a series of papers documenting the methods, models, analysis and results of this integrated assessment for numerous scenarios of future climate change. Innovations described include the integration of water resource and agricultural modeling and the refinement of an agriculture and land-use economics model to incorporate results from process-level ecosystem models of agriculture, water and natural ecosystem resources.The papers are available online at the Climatic Change web site, or contact the paper authors for more information.