The amount of time without sea-ice is becoming too long for the bears to survive, experts say.
"The bears know the ice will be back soon - they're waiting," says Alysa McCall, from Polar Bears International .
About 2,000km south in Montreal, world ministers are gathering at the UN biodiversity summit in an effort to reach an agreement that will to protect wild spaces and reverse the human-driven loss of nature. "At 180 days [without sea-ice], we start to see impacts on their reproductive success," Dr Lehner says. "So beyond that, we're likely to see declines, simply because they can't reproduce successfully any more.", including berries, eggs, small rodents and even reindeer, Ms McCall says, "but nothing replaces that [high fat] seal blubber".
"The sea-ice projections are strongly dependent on the temperature - and the temperature is dictated by how much greenhouse gas we emit into the atmosphere," Dr Lehner says.
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