Humans destroy it indirectly Bearing racist atmosphere of virtual weapons to bounce back to the ice. It is said that if temperatures rise more. And ice sheets melt down like this polar bear will be extinct in the next century. I do not think that long! That is very fast Compared to evolve until they come up. And if you look at human behavior in today's global warming continues to innovate continuously. Balance is not much time left. For the world's largest terrestrial carnivorous species.