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Probably a terrible idea, but melting the plastic and extruding the plastic in underground abandoned mines, filling up the empty spaces like icing on a cake from floor to ceiling. There are abandoned lead mines in Oklahoma, where the town was vacated because of the toxicity and the ground collapsing underneath. A place like that seems ideal.
Part of my reasoning is that it’s also a form of carbon sequestering. Most plastic comes from petroleum, from the ground, and then they would be just putting it back in the ground. The deeper the better.