Combo photo taken on March 25, 2017 shows the Obelisk with light off (down) and on during the Earth Hour in Buenos Aires, capital of Argentina. (Xinhua/Martin Zabala)
Combo photo taken on March 25, 2017 shows the Obelisk with light off (down) and on during the Earth Hour in Buenos Aires, capital of Argentina. (Xinhua/Martin Zabala)