In North America they were perfectly happy on the prarie untill forced into the mountains by people.
There were once a small portion of grizzlies that inhabited a part of the western US prairies, but the vast majority of them have and do inhabit forested, mountainous, and higher altitude terrain.
You are taking an exception and speaking of it as if it were the rule.
I wasn't talking about Russia but the fact that they migrated here shows how good they are at adapting.
Whooooooooooooosh! That's the sound of the point flying well above your head. Sure they are adaptable, to a degree. The point was that grizzlies started out as high-altitude, rough terrain animals. And then they migrated, and a few adapted to prairie life. The were not originally prairie animals, as you said. lol
The ice in Hudsons bay has not melted any faster in the last 7 years,the arctics pretty simple,hudsons freezes late september if the tundra is red and if it isn't red then early september.
From here:
http://www.socc.ca/cms/en/seaIce/pastSeaIce.aspx
I know you don't like graphs, charts, and stuff because you haven't a clue how to read them (and they usually prove you wrong), but give it a try.
The red tundra thing is something I learned from very seasoned arctic exploration people with many decades up there.
It has a lot to do with the winter darkness and lack of sunshine.
So explain further this "red tundra" thing.
Grizzlies live right on the ocean from about Toba inlet north. Could be even farther south but that is as far down the coast I have ever seen one on the shoreline.
Look at the terrain from Toba Inlet north. Those shores are on the edges of mountainous and/or heavily forested regions with very few people inhabiting them.
You are doing the same as Krapatoe and taking an exception and treating it as if it were the rule. Most grizzlies inhabit mountainous, forested areas. They always have.
Anyway, I can't see the population of polar bears dwindling. But I can see them evolving into being smaller bears because they have to adapt to a different lifestyle.