the nine states that have

ARTS & LETTERS
passed deposit laws requiring the return of plastic soda bottles. Such obligatory pro- grams ensure 70 to 90 percent participa- tion rates consumers; only 10 to 30 per- cent participate in the purely voluntary recycling efforts of towns and cities.
Collecting, sorting, and reprocessing plastics remains an expensive proposition. But the plastics industry, fearful of legisla- tive efforts to curb the use of plastics, is working hard on these problems. It...