In a moment being celebrated by global marine conservationists, a new UN high seas treaty comes into force on January 17 providing a new way to govern the world's oceans.

The UN high seas treaty will allow for the creation of protected areas in international waters, like national parks. But the treaty has some grey areas – notably its powers to regulating fishing in international waters, and mining of the seabed.

In this episode we speak to Callum Roberts, professor of marine conservation at the University of Exeter in the UK, about how the treaty came to be and the challenges now facing its implementation.

This episode was written and produced by Mend Mariwany and Gemma Ware. Mixing by Michelle Macklem and theme music by Neeta Sarl. Read the f ull credits for this episode and sign up here for a free daily newsletter from The Conversation.

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