While climate change is drastically impacting polar bears' habitats by shrinking the Arctic ice they call home, Scientific American reports some of the bears are being forced to change their diets, resulting in lower mercury consumption. Mercury is toxic to the bears, and can impair neurological development if consumed at high levels.
Melissa McKinney, an ecotoxicologist at the University of Connecticut, conducted a study of the Southern Beaufort Sea polar bear subpopulation. Studying hair samples from 2004 to 2011, McKinney saw "a 65% drop in the bears' mercury levels."
Good news/Bad news: McKinney said while the "bad news is that the bears are losing vital habitat," the good news is that bears being forced to change their diets "have lower levels of toxic mercury."