Human: Is it true that the polar bears are going extinct? Assistant: 
Yes, it is true that the polar bear population is declining. The main cause of this decline is climate change. As the Arctic sea ice melts, the polar bear's habitat is shrinking and they are forced to swim farther for food. This can lead to exhaustion and death from drowning. Climate change has also caused an increase in the number of predators like killer whales who prey on polar bears.