Not to mention, while it needs a solution, long term storage doesn't have to be solved today. Or tomorrow, or even fifty years from now. Climate change on the other hand will not wait fifty years for us to get around to facing it.
I'd much rather my children face the narrow technical challenge of long term storage, as opposed to global migration crises, drought, and famine.
Dry cask storage will not be without issues on the 100 year time frame. However, I am relatively well convinced that this will be a problem in the billions in cost. That is a lot, but not $10s of billions or $100s of billions. A single national reprocessing facility is >$10 billion.
The simple truth is that radioisotopes decay. When you split Uranium, you dig up the nuclear dust. The more years you give it, the more it settles.
Don't get me wrong, fuel cladding is going to be popping, leaking, and breaking all over those racks of fuel in dry Helium atmosphere or whatever it is.
Also, companies who want to do US reprocessing (but will not anytime soon b/c of $$) are ready to cherry-pick the living daylights out of the fuel inventory. In another 50 years, the best fuel candidates will be vastly more economically attractive. You have the burn history of each fuel assembly, and you know which has the most good stuff and the least bad stuff. Time tends to shift that ratio in the right direction.
I'd much rather my children face the narrow technical challenge of long term storage, as opposed to global migration crises, drought, and famine.