Polar bears, which occur in 19 subpopulations throughout the Arctic, rely on diminishing sea ice to hunt for seals.
A polar bear steps out of a pool while walking on the ice in the Franklin Strait in the Canadian Arctic Archipelago.
A study published Thursday in Science’s Policy Forum says scientists for the first time are able to directly quantify the impact of human-caused greenhouse gas emissions from specific sources on polar bear cub survival. A 2020 study found the number of fasting days, determined by the number of ice-free days every summer, directly affected cub survival. The new study, authors said, took that a step further and quantified the number of ice-free, fasting days caused by a specific amount of human-caused greenhouse gas emissions — distinct from what’s already in the atmosphere.
But the lack of consistent estimates of population trends and survival rates for some polar bear subpopulations, which are distributed over a very large geographic area with differences in sea ice and food sources, can be “problematic when you’re trying to to match for recent greenhouse gas emission trajectories with population survival rates,” he said.
“I think it takes us a little bit closer to understanding some of those relationships, but ... I just don’t know that this paper pushes it over a new threshold,” said Andrew Derocher, a polar bear expert and biological sciences professor at the University of Alberta, who believes polar bears are at risk of extinction long-term. “I just don’t think that this is the smoking gun that is going to change opinion.
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Study connects greenhouse gas emissions to polar bear population declinesNew research from the University of Washington and Polar Bears International in Bozeman, Montana, quantifies the relationship between greenhouse gas emissions and the survival of polar bear populations. The paper, published online Aug. 31 in Science, combines past research and new analysis to provide a quantitative link between greenhouse gas emissions and polar bear survival rates.
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Scientists say study found a direct link between greenhouse gas emissions and polar bear survivalScientists say in a new study that they've established a direct link between greenhouse gas emissions and polar bear cub survival
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Scientists say study found a direct link between greenhouse gas emissions and polar bear survivalScientists say in a new study that they've established a direct link between greenhouse gas emissions and polar bear cub survival
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Scientists say study found a direct link between greenhouse gas emissions and polar bear survivalScientists say in a new study that they've established a direct link between greenhouse gas emissions and polar bear cub survival.
続きを読む »
Scientists say study found a direct link between greenhouse gas emissions and polar bear survivalScientists say in a new study that they've established a direct link between greenhouse gas emissions and polar bear cub survival
続きを読む »
Scientists say study found a direct link between greenhouse gas emissions and polar bear survivalScientists say in a new study that they've established a direct link between greenhouse gas emissions and polar bear cub survival.
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