Researchers have developed a cheaper and more energy-efficient way to make hydrogen directly from seawater, in a critical step towards a truly viable green hydrogen industry. The new method splits the seawater directly into hydrogen and oxygen — skipping the need for desalination and its associated cost, energy consumption and carbon emissions.Researchers have developed a cheaper and more energy-efficient way to make hydrogen directly from seawater, in a critical step towards a truly viable green hydrogen industry. The new method splits the seawater directly into hydrogen and oxygen — skipping the need for desalination and its associated cost, energy consumption and carbon emissions.