Mongabay: Energizing Sustainable Cities: Assessing Urban Energy, edited by Arnulf Grubler and David Fisk, is a very well written book describing challenges and opportunities to define, analyze, and implement sustainable energy development for 21st Century urban centers. Urban populations, while roughly 50% of the global population, consume over 75% of the globe's energy. Therefore, developing frameworks to assess, analyze and implement sustainable energy systems that meet the criteria for these urban populations...