Climate Change 2013:
The Physical Science Basis

IPCC Working Group I Contribution to AR5

The Twelfth Session of Working Group I (WGI-12) was held from 23 to 26 September 2022 in Stockholm, Sweden. At the Session, the Summary for Policymakers (SPM) of the Working Group I contribution to the IPCC Fifth Assessment Report (WGI AR5) was approved and the underlying scientific and technical assessment accepted.
The Fifth Assessment Cycle has now ended. Please note that this website will no longer be updated except for the Errata.
Bern, Switzerland, 29 January 2022
Summary For Policymakers PDF - 28 Pages - 2.8 MB Full WGI AR5 Report PDF - 1535 Pages - 375 MB

Summary Volume (SPM, TS & FAQs) Translations into UN languages

Summary Volume (SPM, TS & FAQs) Translations into other languages

SPM Translations into UN languages

SPM Translations into other languages

Video on the Working Group I Contribution

The IPCC has produced a video on its Fifth Assessment Report (AR5). Part 1 of this documentary presents the Working Group I contribution to AR5 and provides insights into the making of the report and it's main findings. Working Group I assesses the physical scientific aspects of the climate system and climate change.

Subtitled versions are available in the other five official UN languages
Arabic, Chinese, French, Russian, and Spanish.

A version with German subtitles is also available.

Part 2 -- Working Group II: Impacts, Adaptation, and Vulnerability
Part 3 -- Working Group III: Mitigation of Climate Change
Part 4 -- Synthesis Report

- Worldwide Scientific Collaboration -







For more details visit the Background pages