Montreal Gazette: Whatever other issues emerge, one main axis of this federal election campaign is plainly Liberal leader Stéphane Dion’s “Green Shift.” Let us set aside, for now, the reality that even if Canada’s two per cent of the world’s greenhouse-gas emissions fell to zero, global emissions would keep right on climbing. As an exercise in moral one-upmanship, if nothing else, climate-change policy is a campaign issue. The Liberal goal is to get Canada’s annual production of greenhouse gases …