This year’s global energy crisis has revived international interest in hydrogen’s potential to replace fossil fuels in a wide range of industrial applications, from steelmaking to shipping. Green hydrogen is still massively expensive to produce, reducing its potential for commercial scaling, while gray and blue hydrogen relies on the same fossil fuels that many global markets are trying to move away from. But scientific breakthroughs are piling up to expand the hydrogen rainbow in ways that could sidestep these pitfalls and potentially…