Recent breakthroughs in geological research indicate that numerous hydrogen reservoirs are present in Earth's crust, including in at least 30 U.S. states. This discovery has the potential to significantly speed up the transition from fossil fuels to renewable energy sources. Geologists, led by experts like Chris Ballentine from the University of Oxford, are gaining a deeper understanding of the geological conditions that lead to the formation of natural hydrogen gas underground. A new review article published in Nature Reviews Earth and Environment outlines the key factors that facilitate the creation and accumulation of hydrogen gas in Earth's crust, providing a roadmap for exploration companies. With the knowledge of how hydrogen is released from rocks, experts are focusing on regions like the mid continental rift in Kansas, where significant hydrogen production has occurred. The research also sheds light on the importance of finding the right geological contexts, such as ophiolite complexes and igneous provinces, to maximize the chances of discovering hydrogen reservoirs. The potential of hydrogen as a clean energy source is immense, as it can power various industrial processes with a significantly lower carbon footprint than current methods. By tapping into Earth's natural hydrogen reservoirs, the energy industry could usher in a new era of sustainable energy production and reduce reliance on carbon-intensive practices.