Preview: Ice Planet: Conversation with paleontologist Thomas Halliday, author of "Otherlands," regarding the many faces of Earth over the last 540 million years, vacillating between an Ice Planet such as now, and a Greenhouse Planet. More later.

Oct 20, 01:00 AM

Preview: Ice Planet: Conversation with paleontologist Thomas Halliday, author of "Otherlands," regarding the many faces of Earth over the last 540 million years, vacillating between an Ice Planet such as now, and a Greenhouse Planet. More later.

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Preview: Antarctica: Conversation with paleontologist Thomas Halliday, author of "Otherlands," regarding how the opening of the Drake Passage altered the once verdant Antarctica. More later.
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