Radionuclide pollution or contamination is a longterm bugaboo, but the nasties are in solid form -- concentrated at particular points and not spread through the biosphere. This is in a way easier to handle.
Reprocessing nuclear fuel recovers the one-third of uranium that hasn't been fissioned, and the plutonium that has been generated. Nowadays this is not done in the United States -- though Europe is -- because new-mined fuel is significantly cheaper. Strictly dollars and cents.
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Wanna stop school shootings? End Gun-Free Zones, of course.
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