Five people in Alaska alone have slipped through the ice this year, spurring hunters to ditch snowmobiles for dog sleds.
Canada holds 25 percent of all Arctic ice, only behind Greenland.
A group of Canadian researchers monitored polar bears in the Beaufort Sea, north of Alaska and the Yukon, and Hudson Bay. They found that as sea ice melted, female adult bears and younger bears were paddling distances greater than 30 miles.
It's easy to forget that Antarctica is actually a large continent and not just a warped white blob at the bottom of world maps.