Hydrogen is a dream fuel because it does not generate carbon dioxide when burned.
An article in the Economist describes how a research team based in Germany has found an ingenious way to store and carry hydrogen energy by creating a chemical compound called hydrogen goop.
At Fraunhofer Institute for Manufacturing Technology and Advanced Materials in Germany, Dr Marcus Vogt and his team created a magnesium hydride-based “power paste” that stores hydrogen in a chemical form and ready for release on demand.
Supplying hydrogen as a paste is a way to get around its storage limitation and challenges.
https://climateadaptationplatform.com/hydrogen-goop-stable-way-of-conveying-hydrogen-energy/