Consumers are deeply concerned about the quantity of plastic packaging on the market and have spurred manufacturers to find ways to recycle plastic materials. Despite their efforts, however, only 6. 5 percent of plastic is now being recycled, as compared to 33 percent of container glass. Each of the following, if true, helps to explain the relatively low rate of plastic recycling EXCEPT: ['Many factories are set up to accept and make economical use of recycled glass, whereas there are few factories that make products out of recycled plastic.', 'Plastic polymers tend to break down during the recycling process and weaken the resulting product, whereas glass does not break down.', 'Many plastic products are incompatible and cannot be recycled together, whereas most containers made of glass are compatible.', 'The manufacture of new plastic depletes oil reserves, whereas the manufacture of new glass uses renewable resources.']