Beneath the surface of three continents, ancient rock formations may hold a quiet answer to one of the clean energy transition's most stubborn problems. Scientists in Australia, Canada, and the United States have begun mapping and stimulating naturally occurring hydrogen deposits — a resource that forms through geological processes rather than industrial ones. The discovery arrives at a moment of growing disillusionment with green hydrogen, whose promise of affordable clean fuel has repeatedly collided with the hard economics of manufacturing. Whether this subterranean abundance can be coaxed