Osaka Gas and Mitsubishi Heavy Industries (MHI) have agreed to implement CO2NNEX, a digital platform to visualize traded carbon dioxide at Expo 2025 in Osaka, Japan. The platform will initially focus on managing the environmental value of e-methane and potentially expand to include carbon recycles fuel in the future. This initiative aligns with the private sector's adoption of clean gas certificates to certify the environmental value of e-methane and biogas. Osaka Gas plans to provide on-site-produced e-methane to Expo facilities, managing attributed data and environmental value during production and use demonstrations. By introducing e-methane and enhancing environmental value transactions, Osaka Gas and MHI aim to contribute to achieving a carbon-neutral society by 2030. Furthermore, MHI is exploring the platform's potential expansion to manage CO2 distribution, including the introduction to Asian countries. This collaboration reflects a positive sentiment towards promoting clean energy and sustainability in Japan and beyond.