Well, the problem with the Churchill (Manitoba) polar bears has been known for a couple of years; I saw TV shows about it a couple of years ago. But the Hudson Bay polar bears are a subset of the entire polar bear population, so to extrapolate the condition of these bears to the whole population is certaintly stretching the data. They are, like most top predators, suffering from food-chain concentration of environmental contaminants, but I think other species (such as St. Lawrence belugas and Puget Sound orcas) are in worse shape.
Me too.