Polar bears' primary prey, the ringed seal, are also at risk.
A segment of the polar bear population is at risk of extinction should ice-free periods continue to get longer, researchers have determined using analysis of the sea ice as well as the health of the bears themselves.
MORE: Climate change and loss of sea ice putting polar bears at risk of starvation, collar cameras show MORE: More interactions between humans and polar bears are likely as sea ice melts due to climate change, scientists say
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