ABSTRACT
The technological success of modern society is dependent upon interaction between separate parts of industry. For example, one industry may produce a particular waste product, a consequence of its manufacturing process, which can be used in a totally different kind of industry. An instance of this practice is the manufacture of particle board from wood dust, a by-product of sawmills, which is mixed with adhesive and compressed to make a cheap, alternative material to timber. Another by-product is the fine ash produced by burning coal in power stations. This material is turned into building blocks, and is also used for motorway construction.
