The Intergovernmental Panel on Climate Change (IPCC) is the leading body for the assessment of climate change, established by the United Nations to provide the world with a clear, balanced view of the present state of understanding of climate change. The main activity of the IPCC is to provide in regular intervals Assessment Reports of the state of knowledge on climate change. The latest, "Climate Change 2007," the Fourth Assessment Report (AR4), is presented here in its original, un-edited version. Visit the IPCC web site for a description of the policies and procedures that underlie the Assessment Reports.

Table of Contents

Synthesis Report

• Summary for Policymakers
• Full Text

Working Group I Report: The Physical Science Basis

• Front Matter
• Summary for Policymakers
• Technical Summary
• Frequently Asked Questions
• Chapters:

1. Historical Overview of Climate Change Science
2. Changes in Atmospheric Constituents and in Radiative Forcing
3. Observations: Surface and Atmospheric Climate Change
4. Observations: Changes in Snow, Ice and Frozen Ground
5. Observations: Oceanic Climate Change and Sea Level
6. Palaeoclimate
7. Couplings Between Changes in the Climate System and Biogeochemistry
8. Climate Models and their Evaluation
9. Understanding and Attributing Climate Change
10. Global Climate Projections
11. Regional Climate Projections

Annexes:

• Glossary
• Authors
• Reviewers
• Acronyms
• Uncertainty Guidance Note for the Fourth Assessment Report
• Errata for the Working Group I Fourth Assessment Report

Working Group II Report: Impacts, Adaptation and Vulnerability

• Introduction to the Report
• Summary for Policymakers
• Technical Summary
• Chapters:
  1. Assessment of Observed Changes and Responses in Natural and Managed Systems
  2. New Assessment Methods and the Characterisation of Future Conditions
  3. Fresh Water Resources and their Management
  4. Ecosystems, their Properties, Goods and Services
  5. Food, Fibre, and Forest Products
  6. Coastal Systems and Low-Lying Areas
  7. Industry, Settlement and Society
  8. Human Health
  9. Africa
  10. Asia
  11. Australia and New Zealand
  12. Europe
  13. Latin America
  14. North America
  15. Polar Regions (Arctic and Antarctic)
  16. Small Islands
  17. Assessment of Adaptation Practices, Options, Constraints and Capacity
  18. Inter-Relationships Between Adaptation and Mitigation
  19. Assessing Key Vulnerabilities and the Risk from Climate Change
  20. Perspectives on Climate Change and Sustainability

• Cross-Chapter Case Studies

• Appendices:
  1. Glossary
  2. Contributors
  3. Reviewers
  4. Acronyms
  5. Permissions

Working Group III Report: Mitigation of Climate Change

• Preface and Foreword
• Summary for Policymakers
• Technical Summary
• Chapters:
  1. Introduction
  2. Framing Issues
  3. Issues Related to Mitigation in the Long-Term Context
  4. Energy Supply
  5. Transport and its Infrastructure
  6. Residential and Commercial Buildings
  7. Industry
  8. Agriculture
  9. Forestry
  10. Waste Management
  11. Mitigation from a Cross-Sectoral Perspective
  12. Sustainable Development and Mitigation
  13. Policies, Instruments, and Co-operative Arrangements
• Annexes:
  1. Glossary
  2. Abbreviations, Chemical Symbols
  3. Contributors to the Report
  4. Reviewers of the Report

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