The article discusses the increasing global demand for hydrogen energy and its potential as a green alternative to traditional fossil fuels. It highlights that hydrogen is considered a clean energy source as it only produces heat and water when burned. However, the majority of hydrogen production currently comes from fossil fuels, with less than 1% classified as green hydrogen. This poses a challenge in achieving true decarbonisation. Countries like China and the EU are investing heavily in hydrogen technologies, aiming to shift towards renewable energy sources. Green hydrogen, made using renewable electricity, is praised as the cleanest form of production, but its higher costs present a barrier to widespread adoption. The article also mentions the limited use of green hydrogen mainly in transportation, with examples like hydrogen fuel cell vehicles, buses, and even a hydrogen-powered passenger train in Germany. Despite the progress, challenges such as infrastructure limitations and higher production costs persist. Various countries, including China and the US, are promoting green hydrogen projects through investments and policy initiatives to drive down costs and support the transition to cleaner energy sources.