Yin Yuzhen signs her name after planting a tree in the Maowusu Sandy Land in north China's Inner Mongolia Autonomous Region, Aug. 24, 2026. Retired U.S. teacher Ronald Sakolsky revisited the Maowusu Sandy Land on Monday and planted sapling with his friend Yin Yuzhen, a national model worker who has been planting trees here for four decades, as well as Yin's husband Bai Wanxiang.(Xinhua/Lian Zhen)