This is an announcement of opportunity to recommend experts to the U.S. Government for nomination as Coordinating Lead Authors, Lead Authors, Review Editors, contributing authors and expert reviewers for the Fifth Assessment Report (AR5) of the Intergovernmental Panel on Climate Change (IPCC). Experts are needed in a wide range of fields spanning the science of climate systems and climate change and the scientific, technical, environmental, economic and social aspects of impacts, adaptation, vulnerability and mitigation of climate change. As explained in greater detail below, your recommendations need to be received at the Global Change Research Program (USGCRP), which is coordinating the U.S. nomination process, by 12:00 noon on Monday February 15, 2010. More information is available here.