This book, which contains 13 separately authored chapters, has been developed from the ADAPT Project, focusing on the development of regional adaptation strategies to climate change and climate variability for water, food and the environment in river basins across the world. Chapter 1 describes a generic methodology for river basins (called the Adaptation Methodology for River Basins, AMR). Chapter 2 discusses the use of climate change scenarios as provided by the Intergovernmental Panel on Climate Change and, more specifically, how these scenarios can be used for regional studies. Chapters 3 and 4 describe in more detail the possible consequences of climate change and climate variability for food security and environmental quality. The application of the generic AMR methodology to 7 basin case studies in contrasting geographical areas of the world is presented in Chapters 5-11: Syr Darya (Kyrgyzstan, Uzbekistan, Tajikistan and Kazakhstan), Zayandeh (Iran), Rhine (Germany, Netherlands and France), Mekong (Yunnan (China), Myanmar, Laos, Thailand, Cambodia and Vietnam), Volta (Ghana), Walawe (Sri Lanka), and Sacramento (California, USA), respectively. Chapter 12 integrates the findings of the basin studies and compares these findings with global trends in climate change related to food security. Finally, Chapter 13 gives a summary of the experiences encountered during the ADAPT project, and provides key findings that should be addressed in new regional adaptation studies. This book will be of interest to researchers in climatology, geography, ecology, agriculture, environmental studies and related disciplines.