In a recent study done, that was released on July 6, 2009, states that
not only is global warming threading the existence of polar bears, but
also harmful chemicals that man is releasing into the environment.
Mercury has been found in polar bear bodies. Mercury is ingested
by the polar bear through other animals. It can simply start our as
a small fish, then as it goes through the food chain, it becomes more and
more concentrated. By the time the polar bear eats the seal, the
mercury levels could have a lethal effect on the polar bear.