If I ran the circus, the metal oxides would be made into glass, the glass embedded in large concrete blocks, and the blocks would be dropped into deep ocean trenches where crustal subduction would carry it away for an appropriately long time.

The problem will solve itself.
But not in a nice way.

This glass embeded is what was to be tried to be done at hanford where waste is leaking into the water table and seeeping torwards the river. The project may have been abandoned because no one cares like the damm in iraq
"Lets see how much money we can spend acomplishing nothing,
buy the wrong equipment build every thing with an unuseable design. I think the zeromotorcycle is interesting try to make a big move torwards eletric vehicals. I have been lookin for 3000f maxwell capacitors. Very disapointed about the news about the polution created by cannola into biodiesel. Reconsider sea grown green plants for energy production.