Floating plastic is the new plankton, in some places more abundant than the real thing.
Studying the mess in the Pacific, Charles Moore found more plasto-plankton than similar sized zoo-plankton, the yummy wee animals preferred by 5 out of 6 marine animals surveyed.
Not only worthless as food, this faux-plankton can be a "poison pill" because it absorbs toxic chemicals such as PCBs and other oily pollutants. Nobody knows the full impacts of plastic in our oceans, but examples of dead animals are common.
Worldwide, where ocean currents converge, floating garbage makes a mess of remote beaches and now even remote stretches of ocean. Puts a bit of a new spin on the question: "plastic or paper?"