Washington Post: It was just a theory, but for years scientists believed what years of observation was telling them. As Arctic sea ice melted because of climate change, polar bears appeared to be inching their way toward a final refuge in the icy Canadian archipelago.
Now a new study of polar bear DNA backs that up. Scientists who research the animals across the Arctic teamed up to produce a paper showing that the "directional gene flow" of recent polar bear generations is "moving towards areas with more persistent...