This book is primarily based on data from the third analysis of domestic energy consumption, and it combines the conclusive summarizes from the previous two investigations. The book sets out to extend the spatial dimension of the research to a global one and discusses future development of domestic energy consumption from a global perspective. Additionally, the book seeks to discover general rules and diversity features via comparison, domestic vs. global. Future predictions via observations and summaries of history are provided for the reader in this volume as well. The studies in this volume not only provide a basic and supportive index for academic research, but also provide readers with a concrete sketch for people to understand energy use in their day-to-day lives, and it provides policy makers with fundamental, need-to-know data.