Reuters: Activists from environmental group Greenpeace have climbed aboard an oil drilling rig in the Norwegian Arctic on Tuesday, trying to stop Statoil's exploration plans in one of the world's northernmost prospects, the group said on Tuesday. Greenpeace, which regularly calls Norwegian state-owned Statoil an 'Arctic aggressor', said plans to drill in the Hoop area of the Barents Sea threaten Bear Island, an uninhabited wildlife sanctuary which is home to rare species and occasionally to polar bears....