All of that could be done sustainably if the energy we generated and used was sustainable. Electric trucks and trains, clean energy to run the cleaning facility

All of that could be done sustainably if the energy we generated and used was sustainable. Electric trucks and trains, clean energy to run the cleaning facility, even the glass furnaces themselves can be run off electricity which is great if it is clean energy. And when it does break? You can throw it away without worry because it is completely inert and breaks down into sand. Throw all your glass into a specific area on a coast line and the waves will turn it into sand for free. Throw it in a hole as fill material and nobody will ever care because it doesn't pollute.