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Each region of the world faces different population challenges – reducing fertility, employing a ‘bulge’ of young people or managing ageing populations. Sarah explores these and the global implications for the future.

Paul Theroux in conversation with Martine Croxall at the Royal Geographical Society (with IBG)

Critically acclaimed travel writer and author Paul Theroux joins BBC presenter Martine Croxall on 31 May to talk about his influences and love of the world.