We are living in an era that the world confronts global and urbanization challenges such as environmental concerns, climate change, poverty, slum, economic challenges, social instability, health challenges and so on. It is vital to deal with these challenges to maintain the world and environment for future generations as well as improving livability and quality of life at present. Sustainable development is introduced as a path to deal with these challenges and create more livable and sustainable world. Different paths and techniques could be applied to achieve sustainable development through sustainable and smart cities. Therefore, smart and sustainable cities and countries could deal with global challenges, even making the world as a better place for living. Since we reached the 70ies the technologies and IT became able to change and improve the various energies, business, and even impact our lives. Besides this, they can change the global policy from fossil energy and coal to sustainable renewable energies. In these days, technology and technologies based on information technologies would play significant roles in creating solutions and techniques towards sustainable development. Hybrid businesses, ubiquitous cities, digital cities, smart citizens, ubiquitous and intelligent services including smart mobility, ubiquitous education and so on, are main solutions based on technologies towards sustainable development. One of tools based on technologies could influence on developing sustainability is smart and sustainable energy management that is declared as Ubiquitous Blue-Green energy management by authors. Ubiquitous Blue-Green energy management founded on renewable energies as well as environmentally friendly strategies, sustainable water management and sustainability pillars could reduce environmental challenges like air pollution, water contamination, water shortage, climate change, resource preservation, environment maintenance and so on; towards improving environmental sustainability that is a necessary indicator for sustainable development and existing of livability in this world in future. Fundamentally, Ubiquitous Blue Green Energy Management could develop sustainability through its advantages such as: applying renewable energies, energy efficiency, improving energy security and energy quality, preserving natural resources, being accessible at anytime and anywhere, reducing environmental concerns, cost reduction, improving productivity and efficiency of a business, controlling and managing business processes towards reducing risks, developing successful business with high efficiency, productivity and sustainable cities. Fundamentally, Ubiquitous Blue-Green energy management as a component of urban infrastructure is able to create Ubiquitous Blue-Green city where sustainability, high quality of life and livability are existed. Such urban areas could supply humans ‘needs and make high quality of life as well as sustainable development. In this book, Ubiquitous Blue-Green energy management and how it could be developed are illustrated and it covers: Ages and Waves High Technologies including Intelligence Artificial, Machine Learning and Robotic Technologies such as Virtual Reality, Smartness, Digitalization, Technologies based on Internet and Information Ubiquitous such as Ubiquitous Computing, Ubiquitous Infrastructure and Ubiquitous City, Fossil Fuels Renewable Energies Future of Energies Energy Management Sustainable and Smart Energy Management Blue-Green Strategies Ubiquitous Blue-Green Energy Management and its Benefits Different Tools and Techniques towards Ubiquitous Blue-Green Energy Management including Risk Management, Resource Management, Technologies, Innovations Case Studies: South Korea as Ubiquitous and Germany as Digital Country Relation among Ubiquitous Blue-Green Energy Management and Sustainable Development In particular, Ubiquitous Blue-Green Energy Management is a technique to create sustainable, smart and livable urban areas as well as sustainable environment. Therefore, it is vital to introduce and illustrate it in order to apply it more towards Ubiquitous Blue-Green cities that are able to make the world as a better place for living. Experts from the "German Mittelstand", and International Sustainability Management has written this book which is oriented directly to Managers of Global SMEs. This book is based on the newest updated relevant articles, books, the experience of Professor Dr. Hamid Doost Mohammadian and some other sustainability and energy management leadership that is my main focus in the concept to bring target point of each item to prevent any time and resource wasting to whom they want to read and follow sustainable and smart energy management subjects.