Weight. Glass is pretty heavy, which increases transport cost and fuel usage. TFA also mentions that in applications where transluency is okay, it's a better in

Weight. Glass is pretty heavy, which increases transport cost and fuel usage. TFA also mentions that in applications where transluency is okay, it's a better insulator. https://cen.acs.org/materials/inorganic-chemistry/glass-recycling-US-broken/97/i6 https://cen.acs.org/materials/inorganic-chemistry/glass-recy... > But even if the US shifted more to multistream collection, there are other economic factors standing in the way of increasing glass-recycling rates to European levels. One significant difference between the US and European nations is size. Distances in the US between a materials recovery facility and a cullet supplier, or a cullet supplier and a buyer tend to be greater. Transporting glass waste and cullet is costly because of their weight, and those costs can be a deal breaker for some glassmakers and can prevent would-be cullet suppliers from opening processing facilities. For example, in the US, some materials recovery facilities do not recover any glass from their single streams because there are no nearby buyers to make it worthwhile, according to Rue.