They Lied to Us
The “They” in question are the environmentalists who insisted that plastics are non-biodegradable. (You can find a typical example here. Unlike some people, I actually bothered checking to see if anybody actually said what I claim has been said.) On the other hand, according to Scientific American:
Me to environmentalists: Phphphphtttt!!!!
Last year a group of researchers publishing in the journal Science reported a mystery: during a 22-year survey of plastic accumulation in the western North Atlantic, the scientists saw no increase in the amount of plastic, despite a surge in annual global plastic production from about 75 million to 245 million metric tons over the same period. Where was it going? New research shows marine microbes may be feasting on the debris.