For example, the Arctic, which is the polar bear's home, is experiencing the effects of global warming more than any other places. As the temperature is increasing, ice sheets are becoming smaller and fewer; as a result, polar bears have to spend more time on swimming in the sea to find icy places for hunting and living, which impacts their reproductive capacities and the cubs' chances of survival (NatureCANADA.ca, 2012). The fact is that the population of polar bear has declined by 22 percent over the past decade (NatureCANADA.com, 2012). ...

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