An area for storing ice is seen in this photo taken on Aug. 14, 2017 in an energy station designed for the central business district in Chongqing of southwest China. The energy station, supporting a cooling and heating system using the water from the surrounding rivers, provides a stable and efficient air conditioning for the skyscrapers in the district. The system is proved noise free, zero heat emission and no pollution after two months' trial operation. (Xinhua/Liu Chan)
