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Stage set for battle over Canada-US pipeline

Protesters take part in a rally in central London on April 11, 2013 to demonstrate against the Keystone XL Tar Sands Pipeline as foreign ministers from the G8 group of nations meet nearby. A lengthy battle over the controversial Keystone XL pipeline, whicA lengthy battle over the controversial Keystone XL pipeline, which aims to funnel oil from Canada's tar sands to coastal Texas, heads to the most hotly contested area along the route Thursday.