Toronto Star: A mathematical analysis for the first time has uncovered the prospect of a sudden, dramatic decline among Canadian polar bears as they starve to death. “This is much, much different. This is not a gradual change,” said Dr. Andrew Derocher, one of the world’s leading polar bear authorities and co-author of the study. “We’re looking at a decrease by 20 or 30 per cent or even much more in a year.” The study was released this week just as Environment Canada is meeting to decide, …