Scientists say in a new study that they've established a direct link between greenhouse gas emissions and polar bear cub survival.
Polar bears, which occur in 19 subpopulations throughout the Arctic, rely on sea ice to hunt for seals. As ice melts, they either end up on land or must swim farther from shore to find ice, which hurts their ability to find food and leads to long periods of fasting that deplete fat reserves.
“It’s basically connecting the dots” from emissions to ice-free days to impacts on polar bears, said Amstrup, who believes the method can be applied to many other species, such as sea turtles or coral reefs. He also believes the study makes a case for rescinding the 2008 opinion barring climate considerations, because the Endangered Species Act requires federal agencies to use the best available scientific data.Todd Atwood, a wildlife biologist who leads the U.S.
Another expert believes the study shows a correlation between emissions and polar bear cub survival, but not a direct cause and effect. “I completely agree with the authors that it’s essentially ludicrous that ... we list polar bears as threatened because of climate change, and then we turn around and say we can’t consider the impacts of these federal actions that will increase greenhouse gas emissions,” Rohlf said. “It makes no sense whatsoever.”
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