Book excerpt: Since the hydrological cycle is so intricately linked to the climate system, any change in climate impacts the water cycle in terms of change in precipitation patterns, melting of snow and ice, increased evaporation, increased atmospheric water vapor and changes in soil moisture and run off. Consequently, climate change could result in floods in some areas and droughts in others resulting in varying availability and the quality of water affects the quality of life, food security and also health security. This book examines the impact of climate change on water as well as health.