Since these animals live in remote areas with dwindling predation from man, my scientific hypothesis is that polar bear populations have been increasing for decades and will continue to do so until they are threatened by a lack of food sources. Since their sources of food show no sign of significant change, and diseases are not threatening them, I can logically conclude that polar bears are not disappearing from the world.
Where on earth would you get the idea that polar bear populations are currently in decline? You didn't get that idea from reading the Daily Mirror or some fake news story, did you?
Also, you just tag-spammed the "help" category.