Ivory Trade in Medieval Europe Spurred Rise and Fall of Viking Colonies in Greenland, Walrus DNA Study Finds
The Norse, or Viking colonies in Greenland had a near monopoly on medieval Western Europe’s trade in ivory but precisely overreliance on it may have led to their mysterious vanishing, an analysis of walrus DNA suggests.
Global Sea Level Rise Gravely Underestimated, Tripled since Early 1990s, Study Finds
Rise of global sea level resulting from global warming has been largely underestimated, according to a new study. It has found that global sea level rise accelerated threefold between 1993 and 2012 – from 1.1 to 3.1 millimeters per year….
