Orca 'apocalypse': half of killer whales doomed to die from pollution

Orca 'apocalypse': half of killer whales doomed to die from pollution: Split-view of a killer whale at sunrise off the coast of northern Norway.Banned PCB chemicals are still severely harming the animals – but Arctic could be a refugeAt least half of the world’s killer whale populations are doomed to extinction due to toxic and persistent pollution of the oceans, according to a major new study.