Assessment Report 5 of the IPCC (Intergovernmental Panel on Climate Change) consists of three parts, WG1 (The Physical Science Basis, 1535 pages), WG2 (Impacts, Adaptation, and Vulnerability, 1820 pages), and WG3 (Mitigation of Climate Change, 1435 pages).

The AR5 Synthesis Report contains a brief 150-page summary.

"More than 830 Authors and Review Editors from over 80 countries were selected to form the Author teams that produced the Fifth Assessment Report (AR5). They in turn drew on the work of over 1,000 Contributing Authors and about 2,000 expert reviewers who provided over 140,000 review comments." - How does the IPCC work?

Citation: Stocker, T. (Ed.). (2014). Climate change 2013: the physical science basis: Working Group I contribution to the Fifth assessment report of the Intergovernmental Panel on Climate Change. Cambridge University Press.