The Arab Climate Change Assessment Report was prepared within the framework of the Regional Initiative for the Assessment of Climate Change Impacts on Water Resources and Socio-Economic Vulnerability in the Arab Region (RICCAR). The publication consists of a Main Report and Technical Annex. The Main Report presents a comprehensive picture of the impact that climate change is expected to have on freshwater resources in the Arab region until the end of the century and how this will affect the vulnerability of water resources, agriculture, natural ecosystems, human settlements and people. Case studies findings examining flood frequency, droughts, crop productivity and human health are summarized in the report. These case studies are elaborated in technical reports that complement this main report.