Streets are paved with glass
HONG KONG: Recipe: Crush two glass bottles into fine splinters. Mix with 0.9kg of coal ash and construction waste and 1.04kg of cement. Put the mixture under intense pressure in a brick-making machine for 25 seconds.
Follow the instructions and you won't have a tasty party cake but a 2.6kg "eco-glass" brick that can be used to pave roads.