Canwest News Service: One of the world’s leading experts on greenhouse-gas emissions says environmentalists have incorrectly targeted the Alberta oilsands, and should instead focus on coal-fired electricity. “If we’re serious, we have to think about cutting (emissions) where it’s cheapest. We can’t afford to just spend our money cutting it wherever the current politics tells us to cut it,” says Prof. David Keith, an environmental and energy expert from the University of Calgary, who was voted the top …