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And before you complain about the tiny amount of waste that is left, let me introduce you to K+S facilities in Herfa-Neurode and Zielitz which already store extremely toxic waste for decades.
https://www.kpluss.com/en-us/our-business-products/waste-management/underground-disposal/
Have you heard Greenpeace freak about them?
No. Because they "only" store mercury, cyanide and arsenic waste.
Which does *not* lose toxicity over time, unlike nuclear waste.
What are you going to do about that?