? Aerial photo taken on July 23, 2018 shows a shelterbelt forest along Yarlung Zangbo River in Naidong District of Shannan, southwest China's Tibet Autonomous Region. Over the past four decades, the Shannan people have made achievements in desert control by building a 1.8-kilometer-wide "green Great Wall" that stretches 160 kilometers. More than 30,000 hectares of desert land in the middle reaches of Yarlung Zangbo River has been reclaimed. (Xinhua/Liu Dongjun)