Expanded poystyrene (EPS) packaging, more commonly known as the Dow Chemical brand product "Styrofoam", is thought of as a "single-use" consumer good, yet by design will never fully break down and compost, making that single use last forever. 
Three million tons of polystyrene are produced in the United States each year, and it s lightweight nature and its use with food products make it difficult and expensive to recycle, thus contributing to its accumulation in landfills (comprising as much as 30% of total landfill volume) and as litter (20% of Styrofoam estimated to end up in waterways).
Polystyrene is able to be recycled, but it's kind of a pain in the ass. On a small scale we can clean and break down the polystyrene into a liquid that I can use to make into all sorts of iteresting stuff.