Fifth Assessment Report (AR5)

The Fifth Assessment Report (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) which integrates and synthesizes material in the WG reports for policymakers. The SYR will be finalized on 31 October 2014. 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, AR5 page and on the websites of the working groups.

AR5 Media Portal
Outreach Calendar

Climate Change 2014: 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

Climate Change 2014: 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

Climate Change 2013: 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

Plenary Sessions

IPCC 40th

Copenhagen, Denmark
 (27-31 Oct 2014)


Information for participants

Arrangements for  

Media Interviews 

Media Advisory: Accreditation
     and embargo 

Other meetings taking place at the same venue:

Synthesis Report (CWT-5)
        24-25 October

Future of IPCC
      26 October, 10 am, Room       Harlekin-Columbine

Working Group III 12th / IPCC 39th

Berlin, Germany, 7-12 Apr 2014

Press Release


IPCC 37th

Batumi, Georgia, 14-18 Oct 2013




Press release: Working Group II full report launch 

Statement of IPCC Chair to UN Climate Summit 

Working Group I

Technical Summary and FAQ volumes available in translation 

Task Force on National Greenhouse Gas Inventories (TFI)

Recent Reports