evidence: Polar bears live in one of the world’s harshest environments: the Arctic. Roaming across sea ice, polar bears peer through cracks in the ice to look for ringed seals, their favorite food, in the water below. Almost all of a polar bear’s food comes from the sea, and includes seals, fish, and even beluga whales. The floating sea ice is a perfect vantage point for the bears as they hunt for food. Unfortunately, the amount of sea ice floating in the Arctic region is shrinking each year. The ice is melting as the Earth is warming. Within the next couple of decades, there may be no more sea ice in the Arctic Ocean during the summer.