The 92-year-old controlling shareholder of Viacom and CBS is showing his age, while the Brazilian bank's boss is in jail: Should either remain at the helm? Plus, the case for chipping away at climate change. All in this week's edition of the Viewsroom.

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A preview of the Viewsroom, a new Reuters podcast where each Breakingviews columnists will talk about the big numbers, crunchy deals and nasty spats in global business and economics, offering a weekly dose of financial insight that goes beyond the concise and provocative views readers get from our columns every day.

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