This book elucidates on the bio-conversion of recalcitrant wastes (chicken feathers and sawdust) to bio-methane through anaerobic digestion process using bacterial consortia, considering their environmental impacts such as air and water pollution. The bio-methane thus generated is renewable and can be used as cooking gas, electricity source and automobile fuel. This process of waste conversion to wealth initiative is a novel idea that should benefit students of science and engineering and more also, the professionals in renewable energy industry. This book is borne out of the author`s intensive researches on production of bio-fuels from organic wastes littering our environment.