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How do you do? levonorgestrel spirale costo But the difficulties there are enormous and increasing. Environmental groups and native communities in Canada are opposed. It would be hugely expensive: One study shows a pipeline from Nexen’s fields in Alberta province to the Pacific Coast would cost $6 billion. The United States has already jump-started a plan to export LNG to Asia. And it won’t be long before China produces its own shale gas – it has the world’s largest reserves.