Susan Crockford is a zoologist with more than 40 years of animal science behind her, particularly in the field of Arctic animals (like polar bears).
In short, polar bears are doing perfectly well and, contrary to the doomsday propaganda fed to us by governments, corporate media, and the IPCC, global warming is not killing them. In fact, polar bear populations are healthy, and Arctic sea ice is not melting away.
Arctic sea ice is fine
Official data clearly shows no need for concern.
Fake news everywhere
We are surrounded by fake news and, admittedly, navigating through the fog is not easy. My rule of thumb is to assume an antagonistic position towards the establishment. I will consider an alternative claim before the official claim. (Almost always, as I’ve come to learn, the official claim about anything, is fabricated.)

Similarly, when it comes to polar bears, I put more weight onto the conclusions made by independent researchers like Susan.
I have no doubt that David Attenborough’s fearmongering is unwarranted, and that polar bears are doing just fine.