Polar bears may be the top of the food chain, but they're taking a serious hit from climate change at the top of the world. This week, we meet wilderness photographer Steven Kazlowski. He's spent years getting acquainted with the Arctic, and tells us what he's witnessed, learned, and documented in his latest photo-essay book, "The Last Polar Bear." And we'll get a head start on Christmas celebrations in London, Rome, and Germany. For more information on Travel with Rick Steves - including episode descriptions, program archives and related details - visit www.ricksteves.com.