Hydrogen, the most abundant element in the universe, is typically found bound with other elements—for instance, with oxygen in water or with carbon in methane. However, the discovery of naturally occurring underground pockets of pure hydrogen is challenging this assumption. These hidden reserves are attracting attention as a potentially limitless source of carbon-free energy.
The U.S. Department of Energy is among those taking notice. This year, it awarded $20 million in research grants to 18 teams from laboratories, universities, and private companies. The goal: to develop technologies that can produce cost-effective, clean fuel from underground hydrogen sources.
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