This book serves as a vital foundation for regional collaboration, urging stakeholders to adopt innovative, interdisciplinary approaches. The Hindu Kush Himalaya (HKH) region, renowned for its ecological diversity and essential freshwater resources, faces pressing sustainability challenges that require comprehensive solutions. This assessment report unifies decades of research on the HKH, providing critical insights and practical strategies for sustainable development in the context of rapid urbanization and climate change. Through advanced analysis utilizing long-term time series models...