上图为秦皇岛市金梦海湾片区一处建筑外景灯开启时的照片，中图为秦皇岛市金梦海湾片区一处建筑关闭外景灯时的照片；下图为秦皇岛市金梦海湾片区辖区志愿者使用手机打出光绘图案（新华社记者 杨世尧 摄）。

The combined photo shows a community before (above) and after tuning off lights (middle) and volunteers play with cellphone lights during the Earth Hour campaign in Qinhuangdao, north China's Hebei Province, March 25, 2017. (Xinhua/Yang Shiyao)