3. An important consideration is designing for recycling. At the outset of a new design,
it is becoming increasingly important that the engineer consider the full
ecological cycle including the disposal and reuse of the entire device and its
components. Consider an automobile. Parts appropriate for reuse (either with or
without rebuilding) should be made so that they can be easily removed from a
“junk” car. Dismantling and sorting of parts by material should be made as easy
and economical as possible. It has been somewhat facetiously suggested that
cars be made so that all fasteners break when dropping a junk car from, say, a
height of 30 feet. Automatic devices would then sort the pieces by material for