This resource covers the aspects of energy and its role in society. Over 8000 definitions spanning 40 scientific disciplines; More than 100 'window essays' written by experts, and covering topics of particular scientific, historical or social significance; Over 150 photos and illustrations. In a single volume this work provides a body of knowledge on what is certain to become an increasingly vital area of scientific study in the 21st century. Includes more than 100 mini-essays on subjects of particularly topical interest; Compiled with expert input and advice from a board of outstanding scientists and leaders in the energy field.