WASHINGTON D.C., United States (AFP) — Winter ice in the Bering Sea, in the northern Pacific Ocean between Alaska and Russia, is at its lowest levels for 5,500 years, according to a study released Wednesday. Researchers analyzed vegetation that accumulated on the uninhabited island of St Matthew over the last five millennia. They looked at variations in peat layers of oxygen atoms called isotopes 16 and 18, whose proportions over time correlate with atmospheric and oceanic […]