Edmonton Journal: Until this year, Andrew Derocher was convinced Canadas High Arctic islands, where the sea so far remains frozen, would always support some polar bears while populations declined elsewhere. But a new study modelling melting sea ice shows that wont likely be the case, says the University of Alberta professor and Canadas foremost expert on polar bears. Its pretty clear, by the end of the century all those areas will have problems sustaining a population of polar bears, Derocher said in an interview...