But it seems to me we should consider extracting uranium from seawater as well.
Let's face facts here, if we dig thorium out of the ground we are going to be bringing up more nuclear waste and that is a BAD THING. But, if we extract uranuim from seawater, we are removing a toxic and radioactive! material from the oceans - you know that place where the whales and dolphins live. And if that does not make you realize we need to be pruifying the oceans via uranium extraction, - well then think of the sushi.
Unlike a regular mining operation, not only are we removing that uranium from our global sushi storage facility, but when we use it in our reactors we will be converting some of that nasty stuff into pure energy (helping it to "ascend" as it were). This means that when we are done using it in a reactor - even if we don't do anything else with it, there will actually be less radioactive materials in our ecosphere than before.
more seriously:
Presidential Committee recommends research on uranium recovery from seawater
In a report released on August 2, 1999, the The President's Committee Of Advisors On Science And Technology (PCAST ) recommended that the U.S. consider participating in international research on extracting uranium from seawater:
"One possibility for maintaining fission as a major option without reprocessing is low-cost extraction of uranium from seawater. The uranium concentration of sea water is low (approximately 3 ppb) but the quantity of contained uranium is vast - some 4 billion tonnes (about 700 times more than known terrestrial resources recoverable at a price of up to $130 per kg). If half of this resource could ultimately be recovered, it could support for 6,500 years 3,000 GW of nuclear capacity (75 percent capacity factor) based on next-generation reactors (e.g., high-temperature gas-cooled reactors) operated on once-through fuel cycles. Research on a process being developed in Japan suggests that it might be feasible to recover uranium from seawater at a cost of $120 per lb of U3O8.40 Although this is more than 10 times the current uranium price, it would contribute just 0.5 per kWh to the cost of electricity for a next-generation reactor operated on a once-through fuel cycle-equivalent to the fuel cost for an oil-fired power plant burning $3-a-barrel oil." [emphasis added]
40 Nobukawa 1994: H. Nobukawa "Development of a Floating Type System for Uranium Extraction from Sea Water Using Sea Current and Wave Power," in Proceedings of the 4th International Offshore and Polar Engineering Conference (Osaka, Japan: 10-15 April 1994), pp. 294-300.
Source: Powerful Partnerships: The Federal Role In International Cooperation On Energy Innovation. A Report From The President's Committee Of Advisors On Science And Technology Panel On International Cooperation In Energy Research, Development, Demonstration, And Deployment. Washington, DC, June 1999, p. 5-26 - 5-27 (download full text , 1.3M PDF format)
BTW current uranium price is $44 per pound - while the above quote is ten years old, it does suggest that the process is certainly as feasible as extracting oil from shale and or tar sands. And it can be sold as removing dangerous poisons from the ocean rather than adding new ones that have been sequestered deep underground.