No, it has nothing to do with “climate change”. The main area we’re talking about (Hudson Bay) which melts every year. The bears hang around the Churchill region because the fresh water coming in from the major rivers. This attracts belugas for the fish and the bears eat belugas. That’s the general Info on why they hang around there.

Some do go inland, following rivers for food. There are some stories of them getting very deep into Manitoba but it is always following rivers.

The grizzlies come closer across the tops of the prairie provinces due to grizzlies being territorial and high populations.

So we naturally have chance encounters.