recyclable

Construction Using Recyclable Plastic Lumber Can Help Reduce Logging

High Density Polyethylene (HDPE) wood, or plastic wood, is composed mostly of recycled plastic from waste products such as jugs and bottles. These are re-manufactured into synthetic wood that looks very much like real one, and can be used in similar applications as its natural counterpart.

In an article for About.com, freelance architecture writer Murrye Bernard contributed some information on the advantages of using plastic wood over the natural variety.
http://www.premierbuildingsupply.com/1/post/2014/04/construction-using-recyclable-plastic-lumber-can-help-reduce-logging.html