PREVIEW-HALLIDAY-DRAKE-10.mp3. Otherlands: A Journey Through Earth's Extinct Worlds. Thomas Halliday. This excerpt features John Batchelor speaking with Thomas Halliday, the author of Otherlands: A Jo

PREVIEW-HALLIDAY-DRAKE-10.mp3. Otherlands: A Journey Through Earth's Extinct Worlds. Thomas Halliday. This excerpt features John Batchelor speaking with Thomas Halliday, the author of Otherlands: A Journey Through Earth's Extinct Worlds. Halliday describes the profound geological event that caused Antarctica to become ice-covered. Previously, the Antarctic Peninsula—including Seymour Island—was connected to Patagonia, maintaining a temperate climate with forests and diverse populations of mammals and birds. The cooling process began when the peninsula moved away from South America, opening the Drake Passage. This opening allowed the circumpolar current to form, isolating the weather system of the South Pole and preventing the exchange of warmth from South America and the tropics. This shift led to the emergence and spread of glaciers across the continent, a process that unfolded over tens of millions of years.