Forum piece on microplastics in Monterey Bay
Didn't take notices after I listened to it, but vageuly remember it was an above average podcast. Key things I actually recall. What makes microplastics bad is bad particles stick on them. And they trick critters into thinking they're full. The reason it was hard to know microplastic levels is even instruments were made from plastic.
Next on the research agenda is finding where microplastics actually come from.