Well, that's lucky. With climate change going the way it is, the polar bears' only hope is probably breeding back in with the grizzly population.
https://www.nytimes.com/2020/07/20/climate/polar-bear-extinction.html#:~:text=Global%20Warming%20Is%20Driving%20Polar%20Bears%20Toward%20Extinction%2C%20Researchers%20Say,-A%20polar%20bear&text=Polar%20bears%20could%20become%20nearly,continues%20unabated%2C%20scientists%20said%20Monday.