The city of Hong Kong is facing challenges in the mass adoption of hydrogen fuel due to its high cost, as highlighted by the environment minister Tse Chin-wan. The government has announced the Strategy of Hydrogen Development, focusing on cost-effectiveness and the city's land constraints. While traditional fuels will be phased out gradually, the first hydrogen-fuelled double-decker bus has already commenced service, along with other trial projects like hydrogen-powered rubbish collection and street washing vehicles. Tse Chin-wan emphasized the importance of transitioning from 'grey' hydrogen, derived from fossil fuels, to 'green' hydrogen sourced from renewable energy for achieving carbon neutrality. Despite the promising potential of hydrogen as a clean energy source, Tse noted that mass adoption is still distant due to the expensive nature of hydrogen fuel. The government's plan includes reducing carbon emissions by 50% by 2035 and achieving carbon neutrality by 2050, with legislative amendments to regulate hydrogen fuel activities. Collaboration with China on hydrogen development is also highlighted, along with support for research, innovation, and infrastructure. Suggestions from environmental groups aim to establish clear targets, strengthen local cooperation, and leverage the Greater Bay Area for regional collaboration in hydrogen innovation.