French police stand at a closed entrance of the Boulevard Peripherique (Paris' ring road) at Porte de la Chapelle in Paris, France, November 30, 2015 due to the opening day events at the World Climate Change Conference 2015 (COP21). REUTERS/Benoit TessierATTENTION EDITORS : FRENCH LAW REQUIRES THAT REGISTRATION PLATE CAN NOT BE PUBLISHED IN FRANCE