Yes, there is uranium in seawater as a trace element. And there is gold in human blood also as a trace element, but nobody uses corpses yet to make gold. In an

Yes, there is uranium in seawater as a trace element. And there is gold in human blood also as a trace element, but nobody uses corpses yet to make gold. In any case there is still a finite amount of it, is not uniformly distributed in the planet, most of them in Australia and nuclear converts it into other elements (if I'm not wrong you can't take the opposite path yet), so is not a renewable resource by definition.