A spokesperson for the council said that, after intense rainfall on Thursday evening, sewage spilled into the River Liffey and flowed to Sandymount Beach."Based on experience of similar past events, a precautionary bathing prohibition has been put in place," said the spokesperson.
It is difficult to estimate a global population of polar bears as much of the range has been poorly studied; however, biologists use a working estimate of about 20–25,000 or 22–31,000 polar bears worldwide.
Scientists have responded by noting that hungry bears may be congregating around human settlements, leading to the illusion that populations are higher than they actually are.
The Polar Bear Specialist Group of the IUCN Species Survival Commission takes the position that "estimates of subpopulation size or sustainable harvest levels should not be made solely on the basis of traditional ecological knowledge without supporting scientific studies." Its preferred habitat is the annual sea ice covering the waters over the continental shelf and the Arctic inter-island archipelagos.
While they are rare north of 88°, there is evidence that they range all the way across the Arctic, and as far south as James Bay in Canada.
Their southernmost range is near the boundary between the subarctic and humid continental climate zones.