Working Group I The Physical Science Basis

The IPCC’s Working Group I (WGI) assesses the physical science of climate change.

The IPCC Working Group I (WGI) examines the physical science underpinning past, present and future climate change.

Scientists all over the world regularly assess the rich body of scientific literature, contributing to an ever-strengthening understanding of how the climate system works, and how it is changing in response to human activity.

The scientific topics assessed by WGI include: greenhouse gases and aerosols in the atmosphere; temperature changes in the air, land and ocean; the hydrological cycle and changing precipitation (rain and snow) patterns; extreme weather; glaciers and ice sheets; oceans and sea level; biogeochemistry and the carbon cycle; and climate sensitivity. The WG1 assessment combines observations, palaeoclimate, process studies, theory and modelling into a complete picture of the climate system and how it is changing, including the attribution (or causes) of change.

The WGI assessment provides scientific information relevant for the global community to meet the challenge of climate change. As well as the global scale, WGI looks at variability and changes happening at a regional level, which is closely tied to how impacts and risks to human and natural systems are changing over time. This is, in turn, related to the assessment of WGII and the need to design effective climate change adaptation policies. Other important policy dimensions of WGI are the assessment of the amount of carbon emissions compatible with climate and energy targets; interactions between land and the climate; and links between climate and air quality. All of these aspects are closely connected with the assessment of WGIII and strategies to mitigate against the impacts of climate change.

Reports

These are published materials composed of the full scientific and technical assessment of climate change, generally in three volumes, one for each of the Working Groups of the IPCC, plus a Synthesis Report. Each of the Working Group volumes is composed of individual chapters, an optional Technical Summary and a Summary for Policymakers.

 
Special Report

Climate Change and Land

August 2019
Special Report

Global Warming of 1.5°C

October 2018
Working Group Report

AR5 Climate Change 2013: The Physical Science Basis

September 2013
Working Group Report

TAR Climate Change 2001: The Scientific Basis

January 2001
Working Group Report

AR2: The Science of Climate Change

February 1995
Working Group Report

AR1: Scientific Assessment of Climate Change

June 1990
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Activities

One of the main IPCC activities is the preparation of comprehensive Assessment Reports about the state of scientific, technical and socio-economic knowledge on climate change, its causes, potential impacts and response strategies. The IPCC also produces Special Reports, which are an assessment on a specific issue and Methodology Reports, which provide practical guidelines for the preparation of greenhouse gas inventories.

 
Lead Author Meetings

First Lead Author Meeting of the IPCC Working Group I Sixth Assessment Report

First Lead Author Meeting of the IPCC Working Group I Sixth Assessment Report Guangzhou, China, from 25 to 29 June 2018

June 25, 2018
Lead Author Meetings

Fourth Lead Author Meeting for the Special report on the impacts of global warming of 1.5°C above pre-industrial levels

Fourth Lead Author Meeting for the Special report on the impacts of global warming of 1.5°C above pre-industrial levels Gaborone, Botswana, …

April 9, 2018
Lead Author Meetings

Third Lead Author Meeting for the Special report on the impacts of global warming of 1.5°C above pre-industrial levels

Third Lead Author Meeting for the Special report on the impacts of global warming of 1.5°C above pre-industrial levels Malmö, Sweden, …

October 23, 2017
Lead Author Meetings

Second Lead Author Meeting for the Special report on the impacts of global warming of 1.5°C above pre-industrial levels

Second Lead Author Meeting for the Special report on the impacts of global warming of 1.5°C above pre-industrial levels Exeter, …

June 5, 2017
Lead Author Meetings

First Lead Author Meeting for the Special report on the impacts of global warming of 1.5°C above pre-industrial levels

First Lead Author Meeting for the Special report on the impacts of global warming of 1.5°C above pre-industrial levels takes …

March 6, 2017
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News

 
Press Release

Selection of Authors for IPCC Sixth Assessment Report

GENEVA, April 6 – The Intergovernmental Panel on Climate Change (IPCC) has invited 721 experts1 from 90 countries to participate …

April 2018
Statement

Media reports on the draft IPCC Special Report on Global Warming of 1.5°C

GENEVA, Jan 11 – The Intergovernmental Panel on Climate Change (IPCC) notes that news articles have appeared citing a draft …

January 2018
Press Release

Registration opens for Expert and Government Review of the Second Order Draft of the IPCC Special Report on Global Warming of 1.5ºC

GENEVA, Dec 15 – The expert and government review of the second order draft of the Intergovernmental Panel on Climate …

December 2017
Press Release

IPCC Special Report on Global Warming of 1.5 ºC Expert Review of the First Order Draft and start of the Third Lead Author Meeting

MALMӦ, Oct 23 – Nearly 500 experts from around the world took part in the recent review of the First …

October 2017
Press Release

IPCC holds First Lead Author Meeting for Special Report on Climate Change and Land

OSLO, October 16 – More than 100 experts from 52 countries met in Oslo on Monday 16 October to begin …

October 2017
Press Release

IPCC holds First Lead Author Meeting in Fiji for Special Report on the Ocean and Cryosphere in a Changing Climate

NADI, Fiji, Sept 28 – From 2 to 6 October 2017 the Intergovernmental Panel on Climate Change (IPCC) will bring …

September 2017
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Co-Chairs

 

Valérie Masson-Delmotte

Co-Chair
France

Panmao Zhai

Co-Chair
China
 

Vice Chairs

 

Noureddine Yassaa

WG Vice-Chair
Algeria

Carolina Vera

WG Vice-Chair
Argentina

Muhammad Tariq

WG Vice-Chair
Pakistan

Jan Fuglestvedt

WG Vice-Chair
Norway

Gregory Flato

WG Vice-Chair
Canada

Fatima Driouech

WG Vice-Chair
Morocco

Edvin Aldrian

WG Vice-Chair
Indonesia
 

TSU Staff

 

Anna Pirani

Head of TSU
France

Wilfran Moufouma-Okia

Head of Science
France

Clotilde Péan

Head of Operations
France

Yang Chen

Science Officer
China

Robin Matthews

Science Officer
France

Sarah Connors

Science Officer
France

Zhou Xiao

Operations
China

Elisabeth Lonnoy

Project Assistant
France

Tim Waterfield

IT Officer
France

Melissa Gomis

Graphics Officer
France

Nicholas Reay

Web Content Manager
France

Rong Yu

Science Assistant
China

Baiquan

Science Assistant
China
 

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