A new treaty for the High Seas

Ocean advocates call it 'the most exciting thing that's happened this century'. The lawless High Seas have a new international Treaty - the UN's High Seas Biodiversity Treaty. It came into force in January, and is the first international agreement to protect the marine environment.  Guest: Rebecca Hubbard, director of the High Seas Alliance, an international not-for-profit organisation which provides governments with expert advice on the treaty. Producer: Ann Arnold