Green hydrogen is derived from renewable energy sources and has a minimal environmental impact, unlike fossil fuels. During the meeting, Koike spoke about green hydrogen being a pillar to achieving a decarbonated society once the system is up and running in Japan's capital. "We have plans to build a supply system, including pipelines, to receive 'green hydrogen' generated around the world," she said. [...] Tokyo officials are now weighing research costs for the plan in its fiscal 2023 budget as an initial step in the undertaking. During the Tokyo Olympics and Paralympics held in 2021, the metropolitan government operated a hydrogen station in the athletes' village in the Harumi district of Chuo Ward in the waterfront area. [...] Koike was the first Tokyo governor to attend a COP conference, metropolitan government officials said. Organizers of the COP27 told the Tokyo government they wanted Koike to attend the meeting because she "is knowledgeable about environmental policies due to her experience of working as environment minister."