Aerial photo taken on Aug. 3, 2018 shows the industrial park of the coal-to-liquid (CTL) project of the state-owned Shenhua Ningxia Coal Industry Group in northwest China's Ningxia Hui Autonomous Region. (Photo: Xinhua/Wang Peng)

Staff members of the state-owned Shenhua Ningxia Coal Industry Group work at a control room of the coal-to-liquid (CTL) project in northwest China's Ningxia Hui Autonomous Region, Aug. 3, 2018. (Photo: Xinhua/Wang Peng)

Aerial photo taken on Aug. 3, 2018 shows the industrial park of the coal-to-liquid (CTL) project of the state-owned Shenhua Ningxia Coal Industry Group in northwest China's Ningxia Hui Autonomous Region. (Photo: Xinhua/Wang Peng)

Aerial photo taken on Aug. 3, 2018 shows the industrial park of the coal-to-liquid (CTL) project of the state-owned Shenhua Ningxia Coal Industry Group in northwest China's Ningxia Hui Autonomous Region. (Photo: Xinhua/Wang Peng)