The melting of polar ice caps caused by global warming have significantly altered the polar bears life habits. In 2002 the Ward Hunt Ice Shelf, which has been in the Arctic for 3,000 years, split in half. The shelf continues to break into smaller pieces. This shelf is also home to the polar bears of the Arctic. Because the shelf has split into multi sections, the polar bears now have a smaller area to survive. This includes a limited food supply. Polar bears are being forced to eat food they do not normally eat because of the diminishing food supply.
Because the polar bears food supply is becoming limited, they now have to travel greater distances to find food. This is not normal behavior for polar bears to exhibit. They are traveling to areas of the planet that do not commonly see polar bears. The journey to the areas to find food is a long and difficult one. Many of the polar bears are not surviving the journey, especially young polar bears. There are numerous threats in the sea waters that are killing the polar bears as well. A couple of these threats include sharks and killer whales.
As the polar bears make their great journey, they have a limited amount of time to find an adequate food supply and then return to Arctic region to hibernate. If the polar bears do not make it back to the Arctic region in time, they will often not survive the frozen sea waters.