The habitat of polar bears is primarily the Arctic region, particularly along the coastlines of the Northern Hemisphere, including areas of Alaska, Canada, Russia, Greenland, and Norway. Polar bears are well adapted to cold environments, with their thick fur and a layer of blubber for insulation. They primarily inhabit sea ice, which they rely on for hunting seals, their main food source. The ongoing effects of climate change pose significant threats to their habitat as warming temperatures cause ice to melt, leading to challenges in finding food and breeding areas, thus impacting their survival.