CBC: Populations of caribou and reindeer, which northern peoples have long relied on, have fallen drastically worldwide over the past three decades, a Canadian study has found. While researchers knew that Canadian caribou populations had been plunging, University of Alberta biologists Liv Vors and Mark Boyce believe their study is the first worldwide analysis. It shows the problem spans the north from Alaska to Scandinavia to Siberia. “This is happening all around the world,” Vors …