We need to know what opportunities there are and what limits exist to the improvement of energy efficiency, since this is the most cost-effective way to abate greenhouse gas emissions. This book presents a method whereby promising technologies can be identified and characterised that can contribute to an improvement of energy efficiency in the long term. An objective measurement of maximum improvement is provided by an analysis of the theoretical minimum specific energy demand. A descriptive inventory is then given of new and conceivable technologies that can improve efficiency, extending...