It’s mostly NOT a problem. You could fit all the US nuclear waste ever generated onto a football field and it’d only be stacked 10 yards high ([source](https://www.energy.gov/ne/articles/5-fast-facts-about-spent-nuclear-fuel)).
Breeder reactors re-cycle the fuel (not recycle, be re-use). The best approach is to design new reactors that operate on Thorium instead of enriched uranium.
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