Finland may have the answer for the world's nuclear waste.

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https://www.science.org/content/article/finland-built-tomb-store-nuclear-waste-can-it-survive-100000-years#:~:text=Onkalo%E2%80%94%E2%80%9Ccavity%E2%80%9D%20or%20%E2%80%9C,reinforced%20with%20spray%2Don%20concrete.