Ridiculous for several reasons.
First, the major actual risk to polar bears is hunting. But since that has been controlled, polar bear populations have boomed.
Next polar bears have been exposed to POPs for decades with no discernible health effects observed.
Finally, the study authors claim that the POPs detected may be different than prior POPs because they are new and different. Still no health effects reported and, importantly: DETECTION ≠ TOXICITY.
The media release is below.
Pollutants in the Arctic environment are threatening polar bear health
A new analysis has found that although the risk of persistent organic pollutants (POPs) in the Arctic environment is low for seals, it is 2 orders of magnitude higher than the safety threshold for adult polar bears and even more (3 orders of magnitude above the threshold) for bear cubs fed with contaminated milk.
Relative to the 1980s, a decrease in risk from legacy POPs is evident for bear cubs, mainly because of international control measures; however, the composition of POPs substantially changes, and the contribution of new POPs (particularly perfluorooctane sulfonate) is increasing.
“This work is the first attempt to quantify the overall risk of POPs for the Arctic ecosystem and to define a ranking in order to highlight the most dangerous chemicals in the mixture,” said Sara Villa co-lead author of the Environmental Toxicology and Chemistry study. “The results demonstrate that international control measures are effective at reducing the risk to ecosystems. Nevertheless it is fundamental to continuously implement the control of new and emerging contaminants,” added co-lead author Marco Vighi.