A recent scientific paper published in Nature Reviews unveils a groundbreaking discovery—a vast reservoir of natural hydrogen hidden beneath the Earth's continental crust. Led by researchers from the University of Oxford, Durham University, and the University of Toronto, this study highlights the potential of natural hydrogen as a clean, large-scale energy source. The Earth's crust has accumulated enough hydrogen over the past billion years to match 170,000 years of current global oil consumption, offering a tantalizing prospect for a low-carbon future. The research identifies two primary mechanisms by which natural hydrogen is formed underground: water–rock reactions and radiolysis. These processes occur over long geological timescales and have led to the creation of significant hydrogen reserves within specific geological settings. While challenges exist in extracting extractable amounts of hydrogen due to factors like gas mixture complications and natural hydrogen production not being renewable on human timescales, the potential of natural hydrogen as a low-carbon energy source remains promising. The low carbon footprint of natural hydrogen production, emitting as little as 0.4 kg of CO₂ per kilogram of hydrogen, makes it a competitive alternative to green hydrogen from renewable sources. The exploration and extraction of Earth's natural hydrogen reserves could revolutionize the global energy transition, providing clean energy at scale and supporting difficult-to-decarbonize industries and transport sectors. With further advancements in technology and exploration, natural hydrogen could play a pivotal role in shaping a sustainable energy system for the future.