The seas around the Antarctic contain some of our last healthy fish stocks. Tight regulation and vicious weather conditions have kept most trawlers out of the southern waters but the global demand for protein could push more fishermen to sail to the frozen south.

For 'Costing the Earth' the chef Gerard Baker travels to South Georgia to hear how scientists hope to maintain the health of the southern oceans in the face of overwhelming odds. Could their experience help the rest of the world secure the future of fish?