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Preview: Al Gore and "An Inconvenient Sequel"

| In this preview of an interview to air on "Sunday Morning," former Vice President Al Gore, who brought his campaign to battle climate change to movie screens in "An Inconvenient Truth," has followed up that Oscar-winning documentary with a new film, "An Inconvenient Sequel: Truth to Power." He talks with correspondent Lee Cowan about rising to the challenge of rising sea levels.