One of the previously stated objectives of this book series is to promote a holistic and integrative approach to building design with a view to encouraging the adoption and development of sustainable principles. Energy is the biggest single resource that affects both human existence on the planet and the future of the planet itself. Energy use plays a major part in our daily existence. Energy is used to keep us warm, drive our cars, make the products we use and go about our lives. This section will discuss energy use in buildings in order to identify ways in which it can be reduced if not altogether dispensed of whenever possible.