It's not yet done outside of a lab setting but we can extract virtually unlimited uranium from seawater https://www.forbes.com/sites/jamesconca/2016/07/01/urani

It's not yet done outside of a lab setting but we can extract virtually unlimited uranium from seawater https://www.forbes.com/sites/jamesconca/2016/07/01/uranium-seawater-extraction-makes-nuclear-power-completely-renewable/?sh=6c9ed2ce159a https://www.forbes.com/sites/jamesconca/2016/07/01/uranium-s..., Since the uranium in seawater is naturally replenished it could be as sustainable as wind or solar and would only add fractions of a cent per kWh to the cost of energy generation.