Hotter seas threaten marine wildlife with extinction - researchers LONDON, May 7 (Thomson Reuters Foundation) - Polar bears and other iconic animals could be extinct by the end of the century if ocean temperatures continue to rise at the current rate, marine biologists warned Monday. So. Why would they die in just a few generations? Fish and seals are there for food. Polar bears have been living in the San Diego zoo for decades, so warmth doesn’t harm them. The oceans are rising so that warmth is well hidden. So what’s going to kill them? The absurdity of the chicken little left in their doomsday predictions is hilarious. They’ve been making this prediction for decades only to find their population increasing.