In the last decade, bioethanol has become a powerful biofuel for the improvement of
environmental pollution such as reduction in greenhouse gas levels. Yet, the source and
type of substrate material plays a crucial role in the bioethanol production process due to the
different compositional characteristics and availability of monomeric sugars. Different
substrates of first, second and third generation fuel sources exist and may be used as
reliable and sustainable substrates for bioethanol generation. The current review provides …