This is a solution without a problem? The global recycling industry has collapsed. It never broke 10% btw, and is currently at 4%. China doesn’t want our trash anymore. No one is buying, regardless of marginal cost.
I restored many old cast iron buildings in NYC that used “bullet glass” paving for the sidewalk above the vault below. These are still manufactured by Circle Redmont (approved by NYC Landmark Preservation Commission) and are beautiful but expensive.