The combo picture taken on March 29, 2014 shows the lighted (up) and unlighted (down) Brandenburg Gate during the Earth Hour 2014 campaign in Berin, Germany. Earth Hour is a global event organized by the WWF and is held on the last Saturday of March annually, encouraging households and businesses to turn off their lights and other electrical appliances for one hour to voice their concern about climate change. (Xinhua/Zhang Fan)