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Many bacteria, eukaryotes, and archea consume hydrogen in their metabolic pathway for producing energy. They have an enzyme called hydrogenase that converts the hydrogen into two hydrogen ions and two electrons. The pathways for breaking down hydrogen have evolved independently in many different organisms. They cultivated archaea in order to make better observations on the enzymes and were able to get a good idea of which enzymes are the most important for hydrogen metabolism, but it still remains a question we do not have all the answers to. Based on alpha-fold(an ai protein-folding predictor), the enzymes required for metabolism in archaea do not require as many iron-sulfur clusters and can work with a smaller structure than bacteria and eukaryote enzymes for breaking down hydrogen. There is predicted association of different metal hydrogenases(mainly iron and nickel hydrogenases that have those metals attached to the protein). All the hydrogenases enable archaea to adapt to many different environments where there is not that much other nutrients. This all has the potential to be harvested so we can use hydrogen power as a green energy.

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