evidence: Q: How fast will polar bears go extinct at the rate that global warming is happening? A: Nobody knows for sure if polar bears will go extinct. Whether that happens depends on what happens to the sea ice in the Arctic, which serves as an important habitat for the polar bears’ main food source: seals. And the sea ice depends very tightly on what happens to carbon dioxide emissions, and we don’t know what’s going to happen there. We have projections based on various emissions scenarios but, as Yogi Berra said, the future is very hard to predict before it happens. [...] So, to answer your question, my best guess is that polar bears could go extinct somewhere between 2050 and 2100.