[the_third_wave]

That's why you use a fast neutron (breeder) reactor to extract up to 90% of the potential fissionable "fuel" from that uranium instead of just a few percent. Another option is the use of thorium of which is there is ca. 3 times as much. By the time both uranium and thorium run out there'll either be practical fusion energy or one of those new battery technologies which are always popping up.

[adrianN]

Now we just have to invest a few hundred billion for a few decades until er have practical commercial breeder reactors, while still burning coal and gas while we wait and see whether the engineers can figure it out.