Phys.org  December 16, 2024 Geologic hydrogen could be a low-carbon primary energy resource; however, the magnitude of Earth’s subsurface hydrogen has not yet been assessed. Researchers at the US Geological Survey combined information from geologic analogs to construct a mass balance model to predict resource potential. Stochastic model results predicted a wide range of values for the potential in-place hydrogen resource with the most probable value of ~5.6 × 106 Mt. Although most of this hydrogen was likely to be impractical to recover, a small fraction (e.g., 1 × 105 Mt) would supply the projected hydrogen needed to reach net-zero […]