Are polar bears a threatened species?

Yes, the IUCN, an association that evaluates the state of nature each year in the world, classes polar bears as “vulnerable”.

Does that mean that polar bears will die out?

Scientists say they could possibly become extinct by the end of the century.

But why could polar bears become extinct? 

First, because of where they live; the ice pack of the North Pole is melting because of global warming.