Biogas and Biodiesel is a book that reports all the key issues associated with the history, production science and technology and the economics of biogas and biodiesel at the global scale. The topics were appropriately selected based on critical survey of a wide range of both previous and most recent literatures. The book was harmonized to fit the demand of students, companies and policy makers. Researchers, especially those in science and technology, will find the book excellent in understanding the appropriate feedstocks, experimental designs, reaction conditions, economic feasibilities and the directions for further studies.