evidence: Some polar bears face starvation as the Arctic sea ice melts because they are unable to adapt their diets to living on land, scientists have found. [...] There are about 26,000 polar bears left in the world, with the majority in Canada. Populations are also found in the US, Russia, Greenland and Norway. [...] "It is likely polar bears will disappear from areas where sea ice will be lost in future, but difficult to say just when and where," said Jon Aars from the Norwegian Polar Institute who was not involved in the study.