Killer whale populations around the world may collapse in as little as 30 to 50 years. Researchers at Aarhus University in Denmark, took biopsies of orcas or killer whales in northern Norway, Iceland, and eastern Greenland and compared datasets from around the world to determine how PCBs are affecting killer whale populations. Of the 19 populations studied, researchers found more than 50 per cent had levels high enough to impair population growth. Orca populations near Iceland, Norway, and Alaska are thriving. "The killer whales that we know frequent the waters off of eastern Greenland … they were quite highly exposed," he said.

Source: CBC News September 27, 2018 14:52 UTC