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Researchers just discovered a massive 'jacuzzi bubbling with almost pure hydrogen' — a lucrative source of clean energy
(www.businessinsider.com)
This is a most excellent place for technology news and articles.
I wouldn't be too concerned about that. Annual hydrogen production is around 120 billion kg per year, which corresponds to about 1.08 trillion liters of water. We use about 4 quadrillion liters of fresh water total each year.