Tackling climate change urgently demands global carbon neutrality. While electrification remains a cornerstone in the race for decarbonization, propelled by the widespread adoption of renewable energy sources such as solar and wind, the focus is now extending to the “hard-to-abate” sectors. These sectors present greater technical challenges, with emissions deeply embedded in fundamental processes and technologies that are challenging to electrify or often beyond the direct reach of renewable energy’s Midas touch. Clean hydrogen is poised to play a crucial role here, emerging as a molecular carrier of energy with capabilities for storage, transformation, and trade, bearing structural similarities to our traditional energy systems. However, unlocking its potential hinges on establishing scalable strategies for hydrogen production and utilization in cost-effective and environmentally sustainable ways. Integration of offshore wind energy and green hydrogen production could be a pivotal step in this direction, enabling opportunities for deep-decarbonization and promoting a sustainable and carbon-neutral future. In tandem, green ammonia is also gaining traction as both a hydrogen carrier and a decarbonization vector, particularly for maritime fuel, power generation, and energy storage. There is a need to understand its role in energy systems decarbonization and where it best fits in the puzzle.