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In a special edition of HARDtalk, recorded in front of an audience at the Editorial Intelligence conference in Portmeirion, North Wales, Stephen Sackur talks to the world renowned American oceanographer, Sylvia Earle. Five decades of underwater exploration have left her convinced that our seas, and therefore our planet, are in grave peril. But how can she convince the world to take notice of a global threat which is by definition, below the surface; invisible to most of us?