How close are we to losing emperor penguins?

The emperor penguin has been moved from "Near Threatened" to "Endangered" on the International Union for Conservation of Nature Red List. Scientists warn that the early break-up and loss of sea ice could halve their population by the 2080s. Climate change is also threatening Antarctic fur seals and southern elephant seals. What exactly is happening at the bottom of the world? Why are species that have survived for thousands of years now at risk? And as scientists and policymakers meet in Hiroshima for the Antarctic Treaty Consultative Meeting, what action will follow? Climate Watch host Zhao Ying speaks with Zhang Yimo, Priority Project Coordinator of WWF China's Sustainable Blue Economy Program.