Producing hydrogen efficiently from waste water and a little salt to create an unlimited supply of essentially free, carbon-neutral energy:
http://www.kurzweilai.net/inexhaustible-source-of-hydrogen-may-be-unlocked-by-salt-water?utm_source=KurzweilAI+Daily+Newsletter&utm_campaign=4694bd72c7-UA-946742-1&utm_medium=email
So...what's the catch?
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