We'll hear environmentalists dreaming, penguins complaining, get close to a glacier giving way and discuss that method of travel with two very small carbon footprints: walking? Guests include JAN MORRIS, the world's foremost travel writer; author SIMON WINCHESTER; science reporter Daniel Grossman, film director Werner Herzog and environmentalist BILL MCKIBBEN. Production of LINER NOTES is made possible through the generous support of Cunard Line: classic British ocean liners offering a most civilized adventure.