Scientists say in a new study that they've established a direct link between greenhouse gas emissions and polar bear cub survival.
FILE - A polar bear walks over sea ice floating in the Victoria Strait in the Canadian Arctic Archipelago, Friday, July 21, 2017.
It “just seems odd" that polar bears were listed because of the loss of sea ice due to global warming “but emissions have not been considered,” said lead author Steven C. Amstrup, chief scientist emeritus at Polar Bears International and a professor at the University of Wyoming. Researchers estimated the relationship between how long bears fasted and each gigaton of cumulative emissions, which they said allowed them to calculate the impact of emissions from specific projects on future polar bear cub survival.
“This is not a critique of them, but ... there’s a lot of subpopulations that are really hard to get to,” he said, adding that there's not enough funding to do that. Dan Rohlf, a professor at Lewis and Clark Law School in Portland, Oregon, and an expert on the Endangered Species Act, said the study makes important advances in understanding the effects of cumulative emissions on polar bears.
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