The amounts of plastics consumed annually all over the world have been growing substantially. Although
low density, strength, user-friendly designs, processing capabilities, long life, as well as light weight coupled
with high cost-effectiveness make plastics very promising candidates for several applications, they however
have ecological issues in terms of waste disposal which has become a major worldwide problem. In fact, there are
both technological and economic issues preventing progresses in this field. Here, an overview of the recycling
and recovery of polymer waste is provided, followed by a brief discussion on the current recycling methods and
technologies covering primary (re-extrusion), secondary (mechanical), tertiary (chemical), and quaternary (energy
recovery) processes. Global polymer recycling markets are then reviewed.