This compelling episode of Nature reveals how an environment in flux is impacting the fate of the magnificent polar bear. From its brown bear ancestry, the predator evolved to be a master of a harsh and unwelcoming ice kin... more »gdom. Intelligent, adaptable, and fierce, the polar bear learned how to survive in a place that offers few comforts to any creature. But now the Arctic is changing. As temperatures slowly rise and the ice recedes, the shore is getting further away. Food sources that the polar bear have come to rely on are becoming less plentiful. In this changing climate, the polar bear is already showing signs of distress. While polar bears struggle, opportunistic grizzlies fare better, as they benefit from the melting Arctic's effects on its ecosystem. As the Grizzly moves into newly opened territories, the polar bear can only wait for the freezing of its one-time kingdom. If the changing world proclaims the grizzly the new king of the Arctic, what will become of the polar bear? This disc includes the bonus episode, "Showdown at Grizzly River."« less