这是江苏省南京市新街口熄灯前（上图）和熄灯后（下图）的拼版照片（新华社记者 孙参 摄）。

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)