This lecture covers the process of methanogenesis, where organisms produce methane through specialized biochemical pathways involving different types of methanogenesis. It also discusses the coenzymes involved in this process, such as Methanofuran, Methanopterin, Coenzyme M, and Coenzyme F430. The lecture further explores the different types of methanogenesis, including Hydrogenotrophic, Methylotrophic, and Acetoclastic methanogenesis, each with distinct pathways and coenzymes. Additionally, it delves into the energy generation mechanisms and the role of methanogens in methane production, highlighting their significance in natural and anthropogenic sources of methane.