What will the city of the future look like? Advanced research and international cooperation, as presented here, have analyzed the problems (urban air and water pollution, waste treatment, illumination) and are offering new ways to solve them. The city in general can be considered on the basis of two models - Sociopolis vs. Technopolis - and these are discussed in terms of their impact on illumination, transportation, efficient energy use, creation of a Network of Integrated Urban Energy Planning. Environmental protection is discussed in terms of clean air, water policy, war on waste and environmental education. R&D for city dwellers focuses on lasers in industry and medicine, solar cars, solar roofs for houses, new food and perfumery additives. The book presents the results of applications and recommendations for the sustainable development of a city and its inhabitants, not only in terms of theoretical ideas but also in terms of facts, with examples and results summarised in tables and illustrated by figures. Remedies are proposed for some of the issues discussed. Audience: Researchers, city managers, business persons and all those interested in, and concerned about, tackling and solving the problems of cities and their human population.