BPA has been used in food packaging since the 1960s. Look for plastic products with a “BPA-free” label, and be aware that plastics marked with recycle codes 3 or 7 may contain BPA.

A newly developed plastic upcycling process works for low-density polyethylene products (LDPE, plastic resin code #4), such as plastic films and squeezable bottles, and polypropylene products (PP ...