Greta Thunberg, the Swedish climate activist, opted to sail to the US from Europe this month, rather than catching a plane. Her choice reflected a growing recognition that air travel carries a heavy cost to the environment. Sylvia Pfeifer, acting industry editor, discusses how airlines are responding to the challenge with Janina Conboye and Leslie Hook.

Contributors: Sylvia Pfeifer, acting industry editor, Janina Conboye, industry reporter, and Leslie Hook, environment correspondent, Producer: Fiona Symon

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