This book is based on the outcomes of a Turkish-Japanese bilateral project dealing with the impacts of climate change on basin agro-ecosystems. The book is unique in showing an up-to-date knowledge for the developing world. The chapters are related to: a) the development and improvement of a regional climate model for a more accurate prediction with higher resolution of future changes in regional climate, b) the structure of land and water management in agricultural production systems in arid areas, especially to quantitatively evaluate the relationships among cropping systems, hydrological cycle and water balance in farmland and its environments, c) the assessment of the impact of climate change and its adaptation on agricultural production systems, mainly on the aspect of land and water management, and d) the vulnerability of agricultural production systems from natural changes and the measures for enhancing sustainability of agriculture. This book elaborates on the methodologies for the assessment of climate change impacts on agricultural production and adaptation In this book, the concepts and processes of an integrated approach are outlined, and its application in a case project is introduced The approaches described in the chapters would be applicable in different situations and could be improved with experience and the introduction of advanced techniques