Therefore, alternative sources of energy are required which are renewable, sustainable and carbon neutral.This textbook explores the production of biofuels as alternatives to fossil fuels, focusing on the technological issues that need to be addressed for any new fuel source. Each type of biofuel currently in production is considered in detail, covering the benefits and problems with production and use and the potential for biological material to provide sufficient energy for the world's population - the principles on which future fuel development are based.