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

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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. 1950

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