Greenpeace is undertaking one of it's biggest missions evers. The organisation is hoping to convince the United Nations to create the world's largest protected area - 1.8 million square kilometres of ocean off the coast of Antarctica. 

Executive Director of Greenpeace NZ Dr Russel Norman talks to Rachel Smalley about why they want this sanctuary and the challenges they have to overcome. 

LISTEN ABOVE AS DR RUSSEL NORMAN TALKS WITH RACHEL SMALLEY