Special thanks go to the United States-based Technical Support Units that compiled these records and supported the Working Groups in their creation. While each official Assessment Report was the work of an international Working Group as a whole, the Technical Support Units directly created much of the additional material archived here, including the videos and the website of the AR5 TSU for Working Group II. The Working Groups recognized here span the Second to Fifth Assessment Report cycles. Particular thanks to David J. Dokken, former Executive Director of the Working Group II Technical Support Unit for the Fifth Assessment Report. This TSU has been the Harvard Environmental Science and Public Policy Archives’ partner in bringing this expanded online collection into reality. Thanks also to the U.S. Global Change Research Program for providing financial and institutional support to facilitate the work of the intergovernmental body.