The article explores the connection between a process used on the International Space Station (ISS) to recycle CO₂ into water and the production of e-methane as a future fuel on Earth. E-methane is created by combining hydrogen from water electrolysis with CO₂ through the Sabatier reaction. This fuel, with properties similar to natural gas, is seen as a crucial element in decarbonizing gas networks globally. Companies and countries are investing in e-methane projects, aiming to integrate it into existing infrastructure without major modifications. The article highlights Japan's ambitious targets for e-methane adoption, with Tokyo Gas leading experiments in Yokohama City. To ensure clean production, partnerships like the one between Mitsubishi Heavy Industries and Osaka Gas are developing digital platforms to manage e-methane certificates and track its environmental impact. Despite challenges such as high production costs and the need for specific feedstocks, the International Energy Agency projects significant growth in e-methane production by 2030. As technology advances, e-methane could play a vital role in global decarbonization efforts, showcasing the potential synergy between space technology and sustainable energy solutions.