The Working Group I contribution to the Sixth Assessment Report addresses the most up-to-date physical understanding of the climate system and climate change, bringing together the latest advances in climate science.
Summary for Policymakers
The Summary for Policymakers provides a high-level summary of the current state of the climate, how it is changing, the role of human influence, and possible climate futures.
The Technical Summary provides a synthesis of the key findings of the Report and serves as a bridge between the Summary for Policymakers and the chapters of the full report.
The 13 chapters of the Working Group I report provide a comprehensive assessment of the current evidence on the physical science of climate change.
Frequently Asked Questions
The Frequently Asked Questions explain important aspects of the report for a broad audience. They are related to the specific Chapters where they appear, but can be relevant to multiple Chapters.
These outreach products provide an entry point for information relevant to regions and sectors. They are fully traceable to the underlying report and Interactive Atlas.
The novel AR6 WGI Interactive Atlas allows for a flexible spatial and temporal analysis of both data-driven climate change information and assessment findings.
Framing, Context and Methods
Chapter 1 introduces the WGI contribution to AR6, its framing and context, and the methods used in the report.
Changing State of the Climate System
Chapter 2 provides evidence for large-scale past changes in selected components of the climate system.
Human Influence on the Climate System
Chapter 3 assesses human influence on the climate system and evaluates climate models on large scales.
Future Global Climate: Scenario-based Projections and Near-term Information
Chapter 4 assesses simulations of future global climate change over the near term, mid- to long term, and out to year 2300.
Global Carbon and other Biogeochemical Cycles and Feedbacks
Chapter 5 identifies biogeochemical feedbacks with potentially significant climatic effects.
Short-lived Climate Forcers
Chapter 6 discusses the evolution of reactive compounds and their effects on climate and global air quality.
The Earth’s Energy Budget, Climate Feedbacks, and Climate Sensitivity
Chapter 7 assesses the major physical processes affecting the evolution of Earth’s energy budget and the associated changes in temperature and the climate system.
Water Cycle Changes
Chapter 8 explores the changing water cycle and its sensitivity to multiple drivers.
Ocean, Cryosphere and Sea Level Change
Chapter 9 assesses the physical processes underlying global and regional changes in the ocean, cryosphere and sea level.
Linking Global to Regional Climate Change
Chapter 10 assesses the foundations of how regional climate information is distilled from multiple, sometimes contrasting, lines of evidence.
Weather and Climate Extreme Events in a Changing Climate
Chapter 11 assesses observed changes in weather and climate extremes, their attribution to human influence, and future projections at global warming levels of +1.5°C, +2°C and +4°C.
Climate Change Information for Regional Impact and for Risk Assessment
Chapter 12 assesses the climate information relevant to regional impact and risk assessment.
The Atlas provides a region-by-region assessment of climate change and includes an innovative online tool, the Interactive Atlas.
Front Matter, Annexes, and Index
Includes Foreword, Preface, Dedication, and Table of Contents