Atmospheric methane concentrations have reached alarming levels, necessitating immediate action to tackle methane emission issues. This article delves into the role of freshwater ecosystems, particularly in the production of methane through the transformation of organic matter in sediments. While the prevailing belief was that methane production primarily occurs in anoxic environments, a methane paradox was observed in oxygenated freshwater ecosystems, leading to the investigation of photosynthetic bacteria's involvement. The article discusses the potential synergistic relationship between oxygenic photosynthetic bacteria and anaerobic methanogenic archaea in driving methane production, challenging conventional knowledge. The study conducted with Cyanobacterium Synechocystis sp. strain PCC6803 and Methanosarcina barkeri demonstrated that light-driven methanogenesis could be significantly enhanced through redox cycling, involving both syntrophic and abiotic processes. These findings not only provide valuable insights into the ecological and biogeochemical significance of photosynthetically regulated methane production but also offer implications for understanding the global methane cycle and its impact on climate change. The research sheds light on the intricate microbial interactions in natural habitats and the potential role of solar energy conversion in methane production, emphasizing the need for a comprehensive understanding of these processes.