A lot of good info in the comments; e.g.

Disclaimer: I own stock in the world’s largest uranium mining company.

It has been stated that the world will run out of uranium in 50 years, or variations thereof. The problem with this statement is you have to ignore a lot of facts to come up with it. This statement assumes that the uranium deposits currently being mined are all that there is. The fact is, we’re currently sitting on at least 50 years worth, and there is no real reason to start mining new deposits at this time. As these deposits get depleted, and as (if) the market price of uranium rises, more exploration will be done, and more deposits will be mined. If the price rises high enough, it becomes feasable to “mine” the uranium dissolved in the oceans. If it rises even higher, it becomes feasable to produce it in breeder reactors. In short, the world is _not_ running out of uranium. Second, the “50 year” statement assumes that we will not improve our reactor technology. In north america, we’re still running 30+ year old reactors that only remove 5% of the available energy in the uranium. The “waste” that comes out of these reactors can be processed and put through again, or can be used in newer designs to extract more energy from the same uranium. So, ignoring the idea of finding new reserves to mine, if we improve our efficiency to even 50%, we’ll now have 500 years worth. (of course, now _I’m_ ignoring the inevitable fact that we will consume more than our current rate over the next 500 years.)

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