The story that won't go away.
[Wildlife Biologist]Bullock believes that thanks to global warming, there isn't enough ice for the bears to fish from. The National Wildlife Federation explains, "As available sea ice decreases, polar bears have to swim farther to find suitable habitat, and it takes much longer to find a meal. Compounding the problem, sea ice loss also impacts polar bears' main food source—seals." Two-thirds of polar bears will disappear by 2050, according to the U.S. Geological Survey.
Today's sea ice extent. This link may be updated frequently, you can see the latest satellite imagery at the link at the bottom of this post. ("Past Imagery Viewer"). You can do comparisons and overlays of the polar ice on separate days or years.
Past Imagery Viewer Here