Aerial photo taken on Jan. 14, 2020 shows the electric buses in Laixi County of Qingdao, east China's Shandong Province. In order to reduce carbon emissions and protect the environment, Laixi County has converted all of its transit buses into 116 electric ones in the urban area by far. (Xinhua/Ding Hongfa)

  A staff member charges an electric bus in Laixi County of Qingdao, east China's Shandong Province, Jan. 14, 2020. In order to reduce carbon emissions and protect the environment, Laixi County has converted all of its transit buses into 116 electric ones in the urban area by far. (Xinhua/Ding Hongfa)

  Aerial photo taken on Jan. 14, 2020 shows the electric buses in Laixi County of Qingdao, east China's Shandong Province. In order to reduce carbon emissions and protect the environment, Laixi County has converted all of its transit buses into 116 electric ones in the urban area by far. (Xinhua/Ding Hongfa)

  A staff member charges an electric bus in Laixi County of Qingdao, east China's Shandong Province, Jan. 14, 2020. In order to reduce carbon emissions and protect the environment, Laixi County has converted all of its transit buses into 116 electric ones in the urban area by far. (Xinhua/Ding Hongfa)

  Photo taken on Jan. 14, 2020 shows the electric buses in Laixi County of Qingdao, east China's Shandong Province. In order to reduce carbon emissions and protect the environment, Laixi County has converted all of its transit buses into 116 electric ones in the urban area by far. (Xinhua/Ding Hongfa)