In the arctic, some polar bears died because of the environment or its food, not all of them died because they were overheating or can't get used to the environment. The warm sea water affects the plants in the water like plankton, they will soon starts to die out because of the strange temperature. The animals that eat planktons are basically shrimps. When the amount of planktons start to reduce, the food for shrimps will be lessening. Therefore shrimps will have less food. Some of them will go out and discover other food sources, but some of them will die. Shrimps are also main food source for cod fish. Once the shrimps start to die or run away, there will be no enough food for the cod fish. Therefore, they either choose to swim away and find other places or die. Seals will be affected by the reducing amount of the cod fish, which left less food for the polar bears. Polar bears are not easy to migrate, they did not born to be in the water like fish. They can't swim all the time. All they can do basically is to stay where they are.
If there is a food pyramid for the arctic food chain, there will be five layers, with plankton at the bottom, then the shrimps, then the codfish, then the seals, and finally the polar bears in the top. As the pyramid goes up, the amount of food will get decreased by ten percent. It will be decreasing like 10, 100, 1000, 10000. There will be 10000 of the food loss for polar bears. Even though they are on the top of the food pyramid, the strongest, but they are also the weakest.
People really need to protect our planet by doing things to help to reduce global warming, like what I mentioned before: reduce, reuse, recycle plastic objects; ride bicycles... Someone will say that it is not their business, but think about it more carefully and make layers of the pyramid higher, one day you will be the one who get less food and suffer from starvation.
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