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AR6 Climate Change 2021:
The Physical Science Basis
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, and combining multiple lines of evidence from paleoclimate, observations, process understanding, and global and regional climate simulations.
Disclaimer: The Summary for Policymakers (SPM) is the approved version from the 14th session of Working Group I and 54th Session of the Intergovernmental Panel on Climate Change and remains subject to final copy-editing and layout.
The Technical Summary (TS), the full Report Chapters, the Annexes and the Supplementary Materials are the Final Government Distribution versions, and remain subject to revisions following the SPM approval, corrigenda, copy-editing, and layout.
Changing by the artist Alisa Singer
"As we witness our planet transforming around us we watch, listen, measure … respond."
Summary for Policymakers
The Summary for Policymakers (SPM) provides a high-level summary of the understanding of the current state of the climate, including how it is changing and the role of human influence, and the state of knowledge about possible climate futures, climate information relevant to regions and sectors, and limiting human-induced climate change. (39 pages)
Technical Summary
The Technical Summary (TS) is designed to bridge between the comprehensive assessment of the Working Group I Chapters and its Summary for Policymakers (SPM). It is primarily built from the Executive Summaries of the individual chapters and atlas and provides a synthesis of key findings based on multiple lines of evidence. (150 pages)
Full report
The thirteen chapters of the Working Group I report provide an assessment of the current evidence on the physical science of climate change, knowledge evaluation gained from observations, reanalyses, paleoclimate archives and climate model simulations, as well as physical, chemical and biological climate processes. (1300 pages?)
| Chapter 1: Framing, context, methods | Download |
| Chapter 2: Changing state of the climate system | Download |
| Chapter 3: Human influence on the climate system | Download |
| Chapter 4: Future global climate: scenario-based projections and near-term information | Download |
| Chapter 5: Global carbon and other biogeochemical cycles and feedbacks | Download |
| Chapter 6: Short-lived climate forcers | Download |
| Chapter 7: The Earth's energy budget, climate feedbacks, and climate sensitivity | Download |
| Chapter 8: Water cycle changes | Download |
| Chapter 9: Ocean, cryosphere, and sea level change | Download |
| Chapter 10: Linking global to regional climate change | Download |
| Chapter 11: Weather and climate extreme events in a changing climate | Download |
| Chapter 12: Climate change information for regional impact and for risk assessment | Download |
| Atlas | Download |
| Chapter 1: Framing, context, methods - Supplementary Material | Download |
| Chapter 2: Changing state of the climate system - Supplementary Material | Download |
| Chapter 3: Human influence on the climate system - Supplementary Material | Download |
| Chapter 4: Future global climate: scenario-based projections and near-term information - Supplementary Material | Download |
| Chapter 5: Global carbon and other biogeochemical cycles and feedbacks - Supplementary Material | Download |
| Chapter 6: Short-lived climate forcers - Supplementary Material | Download |
| Chapter 7: The Earth's energy budget, climate feedbacks, and climate sensitivity - Supplementary Material | Download |
| Chapter 8: Water cycle changes - Supplementary Material | Download |
| Chapter 9: Ocean, cryosphere, and sea level change - Supplementary Material | Download |
| Chapter 10: Linking global to regional climate change - Supplementary Material | Download |
| Chapter 11: Weather and climate extreme events in a changing climate - Supplementary Material | Download |
| Chapter 12: Climate change information for regional impact and for risk assessment - Supplementary Material | Download |
| Atlas - Supplementary Material | Download |
Errata
The IPCC decided in May 2011 to adopt an IPCC Protocol for Addressing Possible Errors in IPCC Assessment Reports, Synthesis Reports, Special Reports or Methodology Reports.
Read the Protocol here: ipcc_error_protocol_en.pdf
In case of a suspected error in an IPCC report, please send a mail to ipccerrorprotocol@wmo.int containing the following information:
- Complete name
- Telephone
- Organization
- Country
- Publication
- Chapter
- Page
- Line
- Comments
Interactive Atlas
The novel AR6 Working Group I Interactive Atlas allows for a flexible spatial and temporal analysis of both data-driven climate change information and assessment findings in the report. It includes two components:
- The Regional Information component provides access to climate change information (variables and derived indices) from the main datasets used in the report.
- The Regional Synthesis component allows the exploration of key synthesized assessments building on multiple lines of evidence across the Working Group I reference regions. This component supports the SPM and is being updated to align with the final approval version (to be presented in late September).
Link to the Interactive Atlas: https://interactive-atlas.ipcc.ch/
Frequently Asked Questions
Frequently Asked Questions (FAQs) explain important processes and aspects that are relevant to the whole report for a broad audience and help to interpret the report. They are related to the Chapter they are assigned to, but can be relevant to multiple Chapters. (34 FAQs)
Regional Fact Sheets
Regional fact sheets are an outreach product that is fully traceable to the Chapters, the Technical Summary and the Interactive Atlas. They constitute an entry point for regionalized information in the AR6 Working Group I report. (11 fact sheets)
Data Access
Data for SPM figures is available from the following weblink:
https://catalogue.ceda.ac.uk/uuid/ae4f1eb6fce24adcb92ddca1a7838a5c
Click on ‘Datasets’ under Related Records to view the catalogue records for each SPM figure and to access the corresponding data. The Abstract field of these catalogue records contains detailed information about the data, including how it should be cited. The data is made available under a Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/).
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