The aim of this thesis is to present the emerging role of the green hydrogen technology, intended as a low-carbon and sustainable alternative to fossil fuels, within the context of the global challenge to achieve carbon neutrality by 2050. A detailed overview of the subject of green hydrogen is provided, including its main characteristics, supply chain, policy framework and market position, with particular emphasis on supply-demand mismatch and barriers. The research highlights the fundamental aspects and increasing development of new ecosystems such as Hydrogen Hubs and Hydrogen Valleys, which could be described as regional industrial clusters where research, innovation and infrastructure converge to advance the deployment of green hydrogen.