Smugglers, refugees, trade and melting ice and polar exploration are part of the conversation as Rana Mitter is joined in the BBC tent at the Hay Festival by Nobel Prize-winning author Abdulrazak Gurnah, whose books have drawn on his birthplace Zanzibar and the refugees arriving at the Kent coast; climate scientist Professor Emily Shuckburgh, who worked at the British Antarctic Survey; and Joan Passey, author of Cornish Gothic, a New Generation Thinker on the scheme run by BBC Radio 3 and the Arts and Humanities Research Council to turn research into radio.

Producer: Ruth Watts

You can find a series of Lunchtime concerts recorded with audiences at Hay being broadcast on BBC Radio 3 and an episode of The Verb with Ian McMillan. The Free Thinking website has a collection of episodes exploring Green Thinking and the environment - and a programmes looking at the history of the sea with artist Hew Locke and three historians.