Global oil and gas giant Shell PLC said this week it is buying one of Canada’s largest n atural gas producers after years of scaling back its Canadian operations. The Financial Post’s Daniel Trainer takes us through a video history of the energy major’s shift in Canada over the past decade from the oilsands to natural gas. From abandoned oilsands projects to this week’s massive natural gas deal, pivotal decisions have reshaped the company’s future in Canada. Shell’s purchase of ARC Resources Ltd. in a $22-billion cash-and-stock deal Monday — one of the largest producers in the prolific Montney formation in northern Alberta — suggests the energy giant is committed to expanding LNG Canada and making this country a key part of its global strategy, observers say. Energy giant Shell to buy Canada's ARC Resources for $22 billionShell's ARC deal seen as win for Mark Carney's pro-oil pivot