The world's oceans are littered with trillions of pieces of plastic -- bottles, bags, toys, fishing nets and more, mostly in tiny particles -- and now this seaborne junk is making its way into the Arctic. From a report: The plastic was discovered by an international team of researchers who circumnavigated the Arctic on a five-month journey aboard the research vessel Tara in 2013. They sampled the ocean water along the way, looking at plastic pollution. And though the plastic concentrations were overall low, they located a specific region located north of the Greenland and the Barents seas with unusually high concentrations. They published their results in the journal Science Advances this week. It seems that the plastic is riding up to the pole with the Thermohaline Circulation, a "conveyor" belt ocean current that transports water from the lower latitudes of the Atlantic Ocean toward the poles. "[A]nd the Greenland and the Barents Seas act as a dead-end for this poleward conveyor belt," Andres Cozar Cabanas, lead author of the study and researcher at the University of Cadiz, Spain, says in a press release.