Recent findings suggest that hydrogen reservoirs are hidden in numerous regions worldwide, including at least 30 U.S. states. This discovery has the potential to expedite the global shift towards cleaner energy sources, replacing traditional fossil fuels. Geologists are working to comprehend how significant hydrogen accumulations develop in order to pinpoint their locations. A recent review article by experts at the University of Oxford sheds light on the generation of hydrogen in Earth's crust, proposing that the planet has produced ample hydrogen over the last billion years to fulfill current energy demands for 170,000 years. However, the accessibility and profitable extraction of this hydrogen remain uncertain. The study identifies key geological conditions required for natural hydrogen gas formation, offering exploration companies valuable insights to identify potential reservoirs more effectively. Clean hydrogen sourced from these underground reserves presents a more environmentally friendly option compared to current methods reliant on hydrocarbons, as it occurs naturally with minimal carbon emissions. The exploration of hydrogen reservoirs involves understanding various geological contexts that could harbor these resources, such as ophiolite complexes, igneous rocks, and ancient greenstone belts. The research emphasizes the importance of considering processes that may affect hydrogen migration or destruction underground, with microbial activity being a potential factor. Overall, the pursuit of clean hydrogen from Earth's crust marks a crucial step towards a sustainable energy future.