Canwest News Service: A top Canadian researcher at the centre of a scientific battle over the fate of polar bears in the melting Arctic says the latest war of words — a published “rebuttal” of a 2008 U.S.-led study that argued climate change may not seriously threaten the iconic species after all — has significant implications in this country. “For Canada, this rebuttal paper has resonance because there has similarly been a certain amount of nonsense questioning whether climate warming is going to be bad …