Polystyrene food packaging is a serious and readily preventable source of marine debris pollution. Polystyrene food packaging is lightweight and areodynamic, so it is easily blown into gutters and storm drains even when "properly" disposed of.  Polystyrene is also very brittle, so when littered it quickly breaks into small pieces making cleanup impossible.

377,579 tons of polystyrene are produced in California alone, including
154,808 tons of food service packaging! That's 154,808 tons of
over-processed plastics designed to head straight to the landfill after
a use time of a minute or less, the time it takes you to drink your
coffee and toss the cup.

Once in the marine environment polystyrene kills marine wildlife because it mimics food but causes starvation or choking if ingested.  Polystyrene food packaging contributes disproportionally to oceanic plastic pollution.  Over 80% of this plastic pollution comes from urban litter.  And in the worst areas of the Pacific Ocean there is already over 40 times more plastic than plankton.

No polystyrene food packaging is recycled anywhere in California, although the plastic industry has attempted to recycle polystyrene transport packaging (at a cost of thousands of dollars per ton).  Most curbside recycling programs in California do not accept any polystyrene plastic resin because it contaminates recycling and is too easily accidentally littered in transportation. 

Polystyrene food packaging is extremely costly to local governments, some of whom are required by law to achieve "zero" trash litter in impaired waterways.  Litter clean-up costs billions, and yet is still innefective. Polystyrene litter must be stopped at its source.

More about Polystyrene:

• California Ocean Protection Council Marine Debris Implementation Plan
• UN Environmental Program Marine Litter Report
• Seattle Plastic Litter Study (Sum.) (Vol. 1) (Vol. 2)
• California Coastal Commission and Algalita Marine Research Foundation Marine Litter Report
• Algalita Marine Research Foundation Plastic Debris Report
• DOC: Cost to Recycle Polystyrene Beverage Containers
• CIWMB: Polystyrene Recycling Costs