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Greenpeace is taking its case against Arctic oil drilling to the skies. Demonstrators are climbing the tallest building in western Europe, London's 87-story Shard, to make their point. Safety personnel and police are watching after the team of six women began ascending the building via the roof of a nearby subway station. They're reportedly "free-climbing" the building; part of its exterior is built like a ladder, the BBC reports.

The Shard is between the three headquarters of Shell, Greenpeace says, and it resembles a piece of ice. At the top, says a climber, "we'll try to hang a huge art installation ... that will make Shell think twice before sending their rigs into the Arctic." The climbers, who have been live-streaming the event via head-mounted cameras, are all highly trained, says a rep. Monitoring police say they got a call about the protest at 4:20 this morning, the Guardian reports. (Read more London stories.)