Im actually a Cambrian explosion of anti-human defenses. Allergens, toxins, whatever kills them and drives them indoors, life will adapt and shepherd. Nature is no virgin goddess ravaged by evil industrial mankind - nature can be hard and fast - almost as if life depends on it.
In the article it says "does not mean that polar bears are at any less risk of extinction". Doesn't sound like 'adapting nicely' to me.