Polar bears primarily inhabit the Arctic regions, including the coasts of Alaska, Canada, Greenland, Norway, and Russia. They prefer sea ice as their natural habitat because it allows them to hunt seals, their main prey. These bears are well-adapted to the cold environment, possessing thick layers of blubber and fur to insulate them against freezing temperatures. The loss of sea ice due to climate change poses a significant threat to their habitat and survival, as it directly affects their ability to hunt and reproduce, highlighting the importance of conservation efforts in the Arctic region.