Every shred of OBSERVABLE evidence says their numbers are increasing at a prodigous rate. The Inuit, who actually live with them, have been stating unequivocally that polar bear numbers are increasing rapidly. That is being supported by actual observations in the field.
Well, then I guess we should listen to the Inuit, right?
Unikkaaqatigiit: Perspectives From Inuit In Canada
When an environmental change occurs, especially one caused in part by human behaviour on a global scale, it doesnÂ’t just affect flora and fauna, it affects all living things including people. To address the impacts of change, it makes sense to consult with those most affected. In this case it is the Inuit, living in the vast Arctic regions, who are feeling the first and substantial effects of global warming. Forces mostly outside of the Arctic have caused climate change, manifested in the Arctic by changing sea-ice, tundra, and wildlife patterns. And the traditional Inuit way of life is threatened.
https://www.itk.ca/publication/canadian-inuit-perspectives-climate-change-unikkaaqatigiit
Autumn freeze-up occurs up to a month later than usual and the spring thaw seems earlier every year. The multi-year sea-ice is smaller and now drifts far from the community in the summer, taking with it the seals upon which the community relies for food. In the winter the sea-ice is thin and broken, making travel dangerous for even the most experienced hunters. In the fall, storms have become frequent and severe, making boating difficult. Thunder and lightning have been seen for the first time.
Hot weather in the summer is melting the permafrost and causing large-scale slumping on the coastline and along the shores of inland lakes. The melting has already caused one inland lake to drain into the ocean, killing the freshwater fish. Around the town of Sachs Harbour, it is causing building foundations to shift.
New species of birds such as barn swallows and robins are arriving on the island. In the nearby waters, salmon have been caught for the first time. On the land, an influx of flies and mosquitoes are making life difficult for humans and animals.
Inuit Observations on Climate Change Project - CASL - IISDnet