Conceptual model of geologic hydrogen resources. Credit: Science Advances (2024). DOI: 10.1126/sciadv.ado0955 A pair of geologists with the U.S. Geological Survey, Denver, has created a model that shows Earth's subsurface may hold up to 5.6 × 106 million metric tons of natural hydrogen. In their study, published in the journal Science Advances, Geoffrey Ellis and Sarah Gelman added factors to a geological model to produce estimates regarding the likely amount of hydrogen in parts of the Earth. P...