Fifth Assessment Report (AR5)

AR5 provides a clear and up to date view of the current state of scientific knowledge relevant to climate change. It consists of three Working Group (WG) reports and a Synthesis Report (SYR). Further information about the outline and content and how the AR5 has been prepared can be found in the AR5 reference document and SYR Scoping document. Information about how the AR5 was prepared can be found here.

  • AR5: Synthesis Report
  • Working Group I: The Physical Science Basis
  • Working Group II: Impacts, Adaptation and Vulnerability
  • Working Group III: Mitigation of Climate Change

Synthesis Report

The Synthesis Report distils and integrates the findings of the three working group contributions to the IPCC Fifth Assessment Report -- the most comprehensive assessment of climate change yet undertaken, produced by hundreds of scientists -- as well as the two Special Reports produced during this cycle.

Summary for Policymakers
SPM + Longer Report
Headline Statements
Factsheets
Quick link to report PDFs


The Physical Science Basis

The Working Group I contribution provides a comprehensive assessment of the physical science basis of climate change. The report includes a detailed assessment of climate change observations throughout the climate system; dedicated chapters on sea level change, biogeochemical cycles, clouds and aerosols, and regional climate phenomena; extensive information from models, including near-term and long-term climate projections; and a new comprehensive atlas of global and regional climate projections for 35 regions of the world.

Summary for Policymakers (ar I en I es I fr I ru I zh)
Working Group I Report website
Quick link to report PDFs

Impacts, Adaptation and Vulnerability

The Working Group II contribution considers the vulnerability and exposure of human and natural systems, the observed impacts and future risks of climate change, and the potential for and limits to adaptation. The chapters of the report assess risks and opportunities for societies, economies, and ecosystems around the world.

Summary for Policymakers (ar I en I es I fr I ru I zh)
Working Group II Report website
Quick link to report PDFs

Mitigation of Climate Change

The Working Group III contribution assesses the options for mitigating climate change and their underlying technological, economic and institutional requirements. It transparently lays out risks, uncertainty and ethical foundations of climate change mitigation policies on the global, national and sub-national level, investigates mitigation measures for all major sectors and assesses investment and finance issues.

Summary for Policymakers (en
Working Group III Report website
Quick link to report PDFs

From the Media Centre

Press Materials

Advisory: the IPCC at COP 20 

Publication of full Working Group III report 

Recorded Press Conference

Press Release (en - ar - zh - fr - ru - sp)

Opening Statement by the IPCC Chair

Recent Reports