In March 2023, a small plane took a 15-minute flight around an airfield in Washington, powered by hydrogen, marking a significant step in decarbonising aviation and other hard-to-abate sectors. Apart from aviation, hydrogen's potential in steel, cement, and agriculture industries is highlighted. The article explores the hydrogen-ammonia nexus, where hydrogen can reduce the carbon footprint of ammonia production, essential for fertilisers. Additionally, the shipping industry is considering ammonia as a clean fuel, emphasizing the need for clean hydrogen production. Governments globally, like the US and Asian countries, are incentivizing clean hydrogen production to drive investments. Challenges such as regulatory barriers, storage, flammability, and cost disparities between renewable and low-carbon hydrogen are discussed, along with the potential for hydrogen to revolutionize hard-to-abate industries if regulatory support and cost competitiveness are achieved.