Polar bears are just brown bears (grizzlies?) that adapt to the ice when present. They're not going anywhere.
no.
POLAR BEARS ARE A SPECIES
Not a subspecies, a SPECIES
Their DNA is over 120,000 years separated from Grizzly Bear, the actual limiting definition of a mammal species.
http://bearwithus.org/8-bears-of-the-world/
"Polar Bears Evolved Just 150,000 Years Ago" : https://www.livescience.com/10956-polar-bears-evolved-150-000-years.html
They can mate and usually create fertile offspring with other bear species, but they are still a completely separate species.
Mate? Yes they can interbreed "Pizzly bears" or "Grolar bears" and these are spotted in the wild, shot and studied.
Here Are 18 Amazing Animal Hybrids You Won’t Believe Exist But Are Completely Real:
http://boredomtherapy.com/real-animal-hybrids/
ASTOUNDING! Look at those! One is the Grizzly and Polar offspring photo.
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