“Polar bears depend on sea ice as a platform for hunting seals. As the planet warms, that ice cover melts earlier and earlier, limiting the amount of time polar bears have to hunt and build up their fat reserves before moving to land. As a result, they can end up skinny and in poor physical health by the end of long ice-free summers.” NYT: Video of Starving Polar Bear Rips Your Heart Out of Your Chest.