We are working on achieving a technological level that will enable us to deconstruct garbage into its elements and then re-use those elements or compounds. A search on "nanotechnology" will bring up far more than you ever wanted to know about it.

This ability, it seems to me, is at most twenty or thirty years in the future. How rapidly it gets deployed is questionable, of course. Depends on how rapidly it can be made profitable.

At that point there will be a landrush to get mining permits on old garbage dumps, especially those from the Age of Plastics, and those where electronic devices have been dumped.

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