As world leaders gather in New York for the UN General Assembly, Gideon Rachman speaks to António Guterres, secretary-general of the UN. Guterres explains why he thinks the organisation remains indispensable - as the world struggles to get to grips with an array of daunting global challenges - including war and climate change.

Clip: The Guardian

Free links:

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Presented by Gideon Rachman. Produced by Fiona Symon. Sound design is by Breen Turner and Simon Panayi.

Read a transcript of this episode on FT.com

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