Water management is a key development challenge in South Asia. The region - one of the most densely-populated and climate-vulnerable parts of the world - has the world's fastest growing regional economy and the largest proportion of poorest people. With 23.7 percent of the global population, but only 4.6 percent of the world's renewable water resources, the management of water is a key development challenge for sustaining growth, livelihoods, and resilience. The key features of this challenge are ensuring a reliable supply of water for food, people, energy, and industry, and managing the consequences of extreme hydrological events. Climate change will compound this challenge; it will impact, though unevenly, water supply, demand and quality, and exacerbate extreme hydrological events.

South Asia is particularly vulnerable to climate change. Most previous studies have focused on the projected impacts of sea-level rise or extreme weather - droughts, floods, heatwaves and storm surges. This study adds to that knowledge by identifying the impacts of long-term changes in the climate †“ rising temperatures and changes in precipitation patterns †“ on living standards. It does so by first building an understanding of the relationship between current climate conditions and living standards across South Asia. The study also identifies the set of climate models that are best suited for projecting long-term changes in climate across South Asia. This novel understanding of living standards and climate change is then combined to project impacts of long-term changes in climate on living standards in South Asia. The study finds that higher temperatures will reduce living standards for most of South Asia, with the severity impacts depending on future global greenhouse gas emissions. The study projects “hotspots†?, which are locations where long-term changes in climate will have negative impacts on living standards. Many hotspots are in locations that hitherto have not been identified as particularly vulnerable to climate change. Moreover, hotspots have distinguishing features that vary from country to country. This detailed assessment provides a mosaic of information that enriches our understanding of how climate change will impact people and which populations are most vulnerable. The report also provides guidance on the kinds of actions are most likely to reduce impacts of climate change in each country. The study is a major contribution to our understanding of how increasing temperatures and changing precipitation patterns interact with social and economic structures at a fine granular level across South Asia.

ACT (Action on Climate Today) is an initiative funded with UK aid from the UK government and managed by Oxford Policy Management. ACT brings together two UK Department for International Development programmes: the Climate Proofing Growth and Development programme and the Climate Change Innovation Programme

This book addresses the most pressing water resource issues in South Asia, particularly in relation to climate change and variability. This is a region characterised by abundant water during the monsoon, when devastating floods occur, and by scarcity of water and droughts during the dry period. These extreme events often cause substantial damage to