Deutsche Welle: The iconic symbol of the Arctic – the polar bear – is under threat from the twin challenges of climate change and lingering chemical pollutants, such as PCBs (polychlorinated biphenyls), which are not breaking down in the region’s cold waters. A comprehensive review of research on polar wildlife published recently in the journal Science of The Total Environment has concluded that the retreat of sea ice cover in the Arctic as a result of climate change could increase the exposure of …