Delegates of the 2013 UN Climate Change Conference walk by as protesters from Greenpeace hold slogans and pictures of detained Greenpeace activists at the National Stadium where the Conference is held in Warsaw, capital of Poland, Nov. 13, 2013. On Sept. 18, 30 Greenpeace activists protested against Arctic oil drilling at a Gazprom oil platform off Russia's northern coast. They were later detained by Russian guards on charges of piracy and then hooliganism. (Xinhua/Zhang Fan)