[Two Bills]

Originally Posted by sounding

Polar bears, like humans, can adapt ...New evidence that polar bears survived 1,600 years of ice-free summers in the early Holocene | polarbearscience

Polar bears may have adapted and survived in those times.
But.
They they had no competition from human development, or population, unlike today's environment.
Totally different situation today. Until animals carry guns, they cannot win!