The combined photo shows buildings in Xinjiekou before (above) and after tuning off lights during the Earth Hour campaign in Nanjing, capital of east China's Jiangsu Province, March 25, 2017. (Xinhua/Sun Can)
The combined photo shows buildings in Xinjiekou before (above) and after tuning off lights during the Earth Hour campaign in Nanjing, capital of east China's Jiangsu Province, March 25, 2017. (Xinhua/Sun Can)