This handy two-volume reference is organized alphabetically, with articles written in a clear, concise manner. The articles, covering petroleum, natural gas, coal, oil shale, and biofuels, are enhanced with illustrations and thoroughly cross-referenced to related articles, giving the most comprehensive coverage possible. Each article is related to the relevant product property and use, as well as the various environmental issues associated with it. Rather than a conglomeration of general articles, this encyclopedia explores the paths that fuel science and technology will take during the 21st century.