Vancouver Sun: A top U.S. geographer says Canada will emerge as a major world power within 40 years as part of a climate-driven transformation of global trade, agriculture and geopolitics highlighted by the rise of the "Northern Rim" nations. UCLA scientist Laurence Smith, whose previous studies have documented the toll that climate change is taking on Arctic ecosystems and communities, examines the full range of effects of global warming — many of them positive for places such as Canada — in his …