Why polar bear are decrease????

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Yesterday I saw small edition from BBC in which they were discussing about the global warming. As i already disscussed about that i want to discuss about the decrease in polar bears. In recent static data from the polar reasearch center which is in US have under gone a deep study and found that polars bears have already in decreasing stage. They mostly live in polar region that is Antartic region. In water there will be ice cubes and its temp is very low. They live in that type of climate. But now since glacius are decreasing the polar bears are also decreasing.