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Author: Polar Bears Are 'On Thin Ice' Polar bears are some of the most high-profile victims of global warming. Theyżre irresistibly cute, and author Richard Ellis says theyżll disappear from the wild within a hundred years as irreversible warming destroys the polar ice caps. Ellis talks to host Guy Raz about his new book, On Thin Ice: The Changing World of the Polar Bear. All Things Considered Play