Will the unicorns of the sea fall silent?

The term “narwhal” derives from the old Nordic for “nár + hvalr”, meaning corpse + whale, which, for these animals, is quickly becoming prophetic. Climate change, with its accompanying increase in human marine activity, has led to the Arctic Ocean becoming noisier. As narwhal rely on sound to communicate and navigate their surroundings, this could result in the extinction of populations like East Greenland's narwhal by as soon as 2025. Mary-Ann Ochota investigates how this issue is at once political, cultural, and environmental and speaks to the scientists, traditional hunters, and activists, who are seeking a solution.