The short answer? It’s not as big a problem as people seem to think it is. If it was left to run free and contaminate groundwater, that would be a huge problem. But it’s not, and our current ways of reusing, decontamination and storage are more than adequate.
[This](https://youtu.be/4aUODXeAM-k) video from Kyle Hill explains it really well.
As for sending it to space? Really, really expensive. And putting it in a volcano would likely create clouds of radioactive dust.
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