圖中這種泡殼塑膠包裝雖然可以回收，但不代表它們總是被回收。PHOTOGRAPH BY HANNAH WHITAKER, NATIONAL GEOGRAPHIC

MONICA SERRANO, NGM STAFF; TANIA VELIN; KELSEY NOWAKOWSKI. SOURCES: UNITED STATES PATENT AND TRADEMARK OFFICE; EPA; VANGEL, THE ASSOCIATION OF POSTCONSUMER PLASTICS RECYCLERS