The Arctic Ocean is the smallest ocean of the world. It covers the northern polar region of the Earth. The Arctic region is a very cold place. The lowest recorded temperature there is minus 68 degrees. In spite of the cold, a lot of animals live on the Arctic ice. The polar bear is one of them. Now, due to global warming, the polar bear is in a serious trouble. The thing is that polar bears hunt seals and they need ice to do this. The bears wait for seals on the ice, hunt them in the water and go back to the shore. If the ice is too thin, it breaks under the bears’ heavy bodies and they may drown. The situation is getting worse and some researchers say the ocean may become ice-free as soon as 2050.