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Greenpeace activists dressed in polar bear costumes and others holding banners stage a protest on May 10, 2012 on the roof of a Shell petrol station in Prague, against the heading of the an icebreaker for Shell's Arctic oil drilling project in the north of Alaska. Environmentalists have pointed to the vastly complicated task of drilling in the harsh Arctic environment, the difficulty of effectively cleaning up any spills in such conditions, and the risks posed to wildlife and native communities in the region's fragile ecosystem. AFP PHOTO / MICHAL CIZEK (Photo credit should read MICHAL CIZEK/AFP/GettyImages) MICHAL CIZEK/AFP via Getty