Is it too late to save the Baltic harbour porpoise?

For thousands of years there have been porpoises in the Baltic Sea – a shy dolphin-like whale. But due to environmental toxins and fishing, their numbers have declined sharply since the mid-20th century. The harbour porpoise population in the Baltic Sea is currently classified as critically endangered. The question is, is it too late to save the porpoise? Interview with porpoise researcher Julia Carlström at the Swedish Museum of Natural History.