A recent study published in Science Advances has unveiled the presence of a vast reserve of hydrogen gas beneath Earth's crust, estimated to hold trillions of tons of this clean energy source. Scientists suggest that even a small portion of this hidden hydrogen could meet global energy needs for the next 200 years, potentially reducing the dependence on fossil fuels. The study highlights that around 6.2 trillion tons of hydrogen could be trapped within rocks and underground reservoirs, significantly surpassing the total global oil reserves by 26 times. Natural hydrogen, produced through geological processes, is seen as a key player in achieving global carbon neutrality. Geoffrey Ellis, a petroleum geochemist with the U.S. Geological Survey (USGS), emphasized that tapping into just 2 percent of these vast hydrogen stocks could facilitate global carbon neutrality for an extensive period. Unlike hydrogen derived from water electrolysis, requiring external energy sources, natural hydrogen found underground is self-generated and stored in reservoirs, allowing it to be accessed as needed without additional energy-intensive storage systems. However, challenges persist in locating and extracting these underground hydrogen deposits due to uncertainties in their exact locations. Estimates on the quantity of hydrogen vary widely, ranging from 1 billion to 10 trillion tons, posing hurdles in exploration. Efforts are being made to enhance the identification criteria for viable hydrogen reserves to unlock their potential for transforming global energy systems. If these reserves prove recoverable, natural hydrogen could revolutionize energy systems worldwide, offering a sustainable alternative to fossil fuels. Researchers are actively working to refine techniques in pinpointing these reserves more accurately, with further developments expected in the near future. The discovery of such massive hydrogen reserves signals a promising shift towards cleaner and more sustainable energy sources, with the potential to reshape the global energy landscape in the coming years.