This volume includes revised versions of most of the presentations made at the International Conference 'Understanding the Earth Sys tem: Compartments, Processes and Interactions" held on November 24-26, 1999 in Bonn. The Conference was organized by the German National Committee on Global Change Research as part of the Bonn Science Festival 1999-2000. The Bonn Science Festival (Wissen schaftsfestival Region Bonn) was organized and funded by sfg Strukturforderungsgesellschaft Bonn/Rhein-Siegl Ahrweiler mbH. The generous support for organizing the conference and printing this volume by sfg is gratefully acknowledged. Additional financial and organizational support for separate workshop sessions and publica tions have also been provided by the German Federal Ministry for Science and Research, BMBF and Germany's major research funding agency, Deutsche Forschungsgemeinschaft. The editors wish to gratefully acknowledge the help, advice and especially patience of many individuals who have contributed to this volume. The contributions are intended to document the debate on crucial issues of the emerging concept of earth system science and to stimulate the necessary scientific discussion. While every effort has been made on the part of the editors to ensure consistency in termi nology, style and methods of quotation, the variety of contributors has inevitably resulted in certain discrepancies. E. EHLERS Bonn, February 2001 T. KRAFFT Contents Part I Panorama: The Earth System: Analysis from Science and the Humanities Chapter 1 Understanding the Earth System - From Global Change Research to Earth System Science. 3 E. EHLERS and T. KRAFFT Chapter 2 Earth System Analysis and Management. 17.

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Inhaltsangabe1 Panorama: The Earth System: Analysis from Science and the Humanities.- 1Understanding the Earth System - From Global Change Research to Earth System Science.- 2Earth System Analysis and Management.- 3The Earth System: A Physiological Perspective.- 4The Earth System: An Anthropogenic Perspective.- 5Man's Place in Nature - Past and Future.- II Focus: Water in the Earth System: Availability, Quality and Allocation in Cross-Disciplinary Perspectives.- 6Global Alteration of Riverine Geochemistry under Human Pressure.- 7Integrated Management of Water Resources.- 8The Challenge of Global Water Management.- III Perspective: Advancing our Understanding: Reductionist and/or Integrationist Approaches to Earth System Analysis.- 9Understanding Climate Variability: A Prerequisite for Predictions and Climate Change Detection.- 10Earth System Models.- 11Climate System and Carbon Cycle Feedback.- 12Global Climate Change and Economic Analysis.- 13From Nature-Dominated to Human-Dominated Environmental Changes.- IV Appendix: Working Group Reports.- 14Water Quality and Health Risks.- 15Urban Thirst for Water and Priorities for Action.- 16Modeling Water Availability: Scaling Issues.- 17Precipitation Variability & Food Security.- 18Interdisciplinary Perspectives on Freshwater: Availability, Quality, and Allocation.- 19Water Deficiency and Desertification.

The Earth System: From Global Change Research to Earth System Science; Earth System Analysis and Management; A Physiological Perspective; An Anthropogenic Perspective; Man''s Place in Nature.- Water in the Earth System: Availability, Quality and Allocation in Cross-Disciplinary Perspectives: Global Alteration of Riverine Geochemistry under Human Pressure; Integrated Management of Water Resources; The Challenge for a Global Water Management.- Advancing our Understanding: Reductionist and/or Integrationist Approaches: Understanding Climate Variability; Earth System Models; Climate System and Carbon Cycle Feedback; Global Climate Change and Economic Analysis; From Nature-Dominated to Human-Dominated Environmental Changes.- Working Group Reports: Water Quality and Health Risks; Urban Thirst for Water and Priorities for Action; Modeling Water Availability; Precipitation Variability and Food Security; Interdisciplinary Perspectives on Freshwater; Water Deficiency and Desertification.