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Increasing public awareness of plastic pollution has raised demand for plastic recycling, but it remains challenging from a technical and economic standpoint, causing it to lag behind the recycling rates of materials like aluminum, glass and paper. In general, there are many different types of plastic and these need to be segregate from one another prior to recycling as they give a poor quality product if mixed. Even when properly sorted and cleaned, the most common form of recycling in which plastic is re-melted and reformed into new items, usually results in polymer degradation at a chemical level, so that quality cannot be maintained. More advanced technologies which may mitigate this degradation suffer from high capital costs and are more energy-hungry. Thus, even though recycling rates are improving, much of this activity merely delays rather than prevents the eventual disposal of plastic as waste. Regardless, life-cycle assessments show recycling, in its various forms, to be a net good for the environment.