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This is Scientific American's 60-second science.

I'm Christopher in Taliatta.

As climate change warms the Arctic, sea ice there is disappearing at record rates,

sea ice that polar bears prefer to prowl.

As a result, some of the bears are spending more time on solid land

and are thus switching up their diets, too.

Instead of the ringed seals, they ate out on the

ice, the bears are foraging on bowhead whale carcasses cast up on the beach. So what does this mean for

the bears? It's sort of good news, bad news. Melissa McKinney, an eco-toxicologist at the University

of Connecticut. The bad news is that bears are losing vital habitat,

but the silver lining is that bears decamping to land

have lower levels of toxic mercury due to their changes in diet.

McKinney and her team studied hair samples

from one polar bear population in Alaska,

from 2004 to 2011.

In that time, they saw a 65% drop in the bear's mercury levels

...