Amid ongoing efforts for regional renewable energy transition toward 2050 carbon neutrality, endeavors continue to resolve regional and national bottlenecks, such as the mismatch between power generation and consumption areas, lack of transmission and storage infrastructure, and rising electricity consumption. Meanwhile, maritime transport, which is the hardest sector to electrify and decarbonize, requires massive amounts of renewable-based clean marine fuels for net-zero by 2050, and green hydrogen and ammonia are drawing attention as critical means for storing surplus renewable energy and decarbonizing ports and shipping. In this session, we aim to explore global-level changes to make the ocean a resource for all, using the green hydrogen production and consumption model in Jeju - a region abundant in renewable energy - as a case study for islands and coastal areas bordering the sea.