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Excerpt from www.scientificamerican.com
Laurent Truche, a geochemist at Grenoble Alpes University in France, has been searching for naturally occurring hydrogen for nearly a decade. This year, in a chromite mine in Albania, he and his colleagues struck gold, or rather another element on the periodic table. Nearly a kilometer below the surface, they discovered a hydrogen seep so strong it turned a murky drainage pond into something resembling a Jacuzzi. Truche had never seen hydrogen bubbles that big. “It was really intense,” he says.
Natural hydrogen is hydrogen gas in its molecular form (H2) that is generated through natural processes. Formed deep within Earth, it may get trapped on its way to the surface, creating accumulations of gas. Confusingly also called “gold,” “white” or “geological” hydrogen, natural hydrogen could offer us an energy source cleaner than other types of hydrogen because there is no carbon involved in the process that generates it (although drilling and distribution would still involve some carbon dioxide emissions, of course). A recent study estimated the greenhouse gas intensity of natural hydrogen to be 0.4 kilogram of CO2 equivalent per kilogram (kg CO2eq/kg), far less than the 22-26 kg kg CO2e/kg of black hydrogen (produced from coal) or the 10-14 kg CO2e/kg of blue hydrogen (produced from natural gas).