New report finds high levels of nutrient pollution tied to Norway's fish farms

Norway is the world's largest producer of farmed salmon. But all those fish farms also come with nutrient pollution. A new report finds that pollution has reached a scale comparable to the raw sewage generated by a country the size of Australia. But not all experts agree that the pollution poses a risk. The World's Host Carolyn Beeler speaks with Aleksander Nordahl, an editor at the Sunstone Institute that produced the report.