Aerial photo taken on Dec. 21, 2019 shows ships moored at the coal port of the Caofeidian port in Tangshan, north China's Hebei Province. From January to November this year, the input of coal at the Caofeidian port in Tangshan has totaled 60.156 million tons while the output of coal 61.708 million tons, both exceeded 60 million tons. (Xinhua/Yang Shiyao)