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). Information about how the AR5 was prepared can be found here.

AR5: Synthesis Report

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
Factsheets
Synthesis Report website
Quick link to report PDFs

Working Group I: The Physical Science Basis

The Physical Science Basis

The WG 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

Working Group II: Impacts, Adaptation and Vulnerability

Impacts, Adaptation and Vulnerability

The WG 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

Working Group III: Mitigation of Climate Change

Mitigation of Climate Change

The WG 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 (ar I en I es I fr I ru I zh)
Working Group III Report website
Quick link to report PDFs

News

The IPCC is preparing a Special Report on the impacts of global warming of 1.5 °C above pre-industrial levels and related global greenhouse gas emission pathways.

Quick Reference

Vacancy Announcement

Head of TSU (Operations), WG III
Head of TSU (Science), WG III

Recent Reports