The universal recycling symbol - a podcast by BBC World Service

In 1970, American architecture student Gary Anderson won a competition, to mark the first Earth Day on 22 April, to design a logo for recycled paper products.

His design of three arrows in a triangle shape remains in the public domain and is now used to mean recycling around the world.

He spoke to Rachel Naylor.

(Photo: Rubbish for recycling on a doorstep for collection. Credit: Getty Images)

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