Scientists from the University of Oxford, Durham University, and the University of Toronto have collaborated to define the geological characteristics necessary for the discovery of natural clean hydrogen sources in the Earth's crust. Published in 'Nature Reviews Earth & Environment', the research outlines the global presence of geological environments suitable for natural hydrogen accumulation. Natural hydrogen, a $135 billion industry crucial for fertiliser and energy production, is considered a key player in the transition towards low carbon emission technologies. The study emphasizes the importance of reducing CO2 emissions associated with hydrogen production and highlights the need for emission-free sources. By identifying accessible geological formations that hold potential natural hydrogen reserves, the research proposes a sustainable solution to the growing demand for hydrogen. The exploration strategy developed by the researchers aims to locate and extract these natural hydrogen reservoirs efficiently. The study dismisses speculations about hydrogen sources from the Earth's mantle and emphasizes the viability of natural hydrogen reservoirs in various geological settings within the continental crust. Lead author Professor Chris Ballentine likens the process of finding accumulated hydrogen to cooking a soufflé, with precision and the right combination of ingredients being essential. The establishment of Snowfox Discovery Ltd. signifies a tangible step towards unlocking significant natural hydrogen accumulations globally. This groundbreaking research opens new possibilities for a cleaner energy future, emphasizing the potential of natural hydrogen as a major contributor to the energy transition in the coming years.