The efficiency arguments against glass that I've seen involve the sheer weight of transport (and the gas / cost involved) from use point to plant, amount of bre

The efficiency arguments against glass that I've seen involve the sheer weight of transport (and the gas / cost involved) from use point to plant, amount of breakage that occurs that endangers employees, and the limited cost savings of recycled glass over new glass. Forget where I read it, but apparently much of the recycled glass is ground up and used for fill because of the lack of demand for the post-recycled product.