Are Some Disputes Beyond Negotiation?

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World oil prices have tumbled after a meeting of major exporters in Doha collapsed without an agreement to freeze output. With many placing blame for the talks' failure on political differences between Saudi Arabia and Iran, we ask Dan Shapiro, founder of Harvard University's International Negotiation Program, whether some disputes are beyond resolution. Also, Lucy Kellaway of the Financial Times blames the advent of email for rampant passive-aggression in the office. And Daniel Gallas reports from Brazil on what next for the country's troubled economy after its president Dilma Rousseff moves one step closer to impeachment. (Picture: Two faces shouting at each other; Credit: Thomas Northcut/Thinkstock)