This book highlights the likely impacts of climate change in terms of global and national water securities, how different countries are attempting to address these complex problems and to what extent they are likely to succeed. A major global concern at present, especially after the social and economic havoc that has been caused by COVID-19 in only one year, is how we can return to earlier levels of economic development patterns and then further improve the process so that sustainable development goals are reached to the extent possible by 2030, in both developed and developing countries. Mankind is now facing two existential problems over the next several decades. These are climate change and whether the world will have access to enough water to meet all its food, energy, environment and health needs. Much of expected climate change impacts can be seen through the lens of extreme hydrological events, like droughts, floods and other extreme hydrometeorological events. Chapter 7 is available open access under a Creative Commons Attribution 4.0 International License via link.springer.com.Chapter 12 is available open access under a Creative Commons Attribution-NonCommercial 4.0 International License via link.springer.com.

Asit K. Biswas is one of the world's leading authorities on water, environment and development-related issues. He is a distinguished academic and has been an advisor and confidant to Presidents, Prime Ministers and Ministers in 23 countries, six Heads of United Nations Agencies, two Secretary-Generals of OECD, several Heads of bilateral aid agencies and four CEOs or Chairmen of major MNCs. He has received numerous international awards, including Stockholm Water Prize, considered to be the Nobel Prize for water. He is a recipient of seven Honorary Doctorates from leading global universities; he is the author of 89 books. His work has been translated into 42 languages. Cecilia Tortajada has been an advisor to major international institutions like FAO, UNDP, JICA, ADB, OECD, IDRC and GIZ and has worked in numerous countries in Africa, Asia, North and South America and Europe on water and natural resources management and environment policies. She is the winner of the prestigious Crystal Drop Award of the International Water Resources Association and a member of the International Selection Committee, Millennium Technology Prize, Technology Academy Finland. She is a past President of the International Water Resources Association and an editor-in-chief of the International Journal of Water Resources Development. She is a leading global authority on urban water and wastewater management, and her work has been translated into eight languages.