This paper introduces CO₂ recovery technology using PDMS rubber that is developed by the National Institute for Materials Science (NIMS). This technology is an efficient capture and liquefaction technology for CO₂ emitted from natural gas fields, biogas plants, thermal power plants, etc. As the related research, we also introduce the salinity gradient power generation project using ion exchange membranes (Cabinet Office SIP) and the development of smart pills (Cabinet Office Moonshot). The former proposes new renewable energy sources, while the latter aims to suppress ruminant methane production.