Aerial photo shows a view of Zhangchuan Village of Tongwei County, northwest China's Gansu Province, June 15, 2022. Photo:Xinhua
Aerial photo shows green hillside with trees planted by twin brothers Xu Zhigang and Xu Zhiqiang in Zhangchuan Village of Tongwei County, northwest China's Gansu Province, June 15, 2022. Photo:Xinhua
Aerial photo shows twin brothers Xu Zhigang and Xu Zhiqiang, 74, driving a tricycle to check the trees in Zhangchuan Village of Tongwei County, northwest China's Gansu Province, June 15, 2022. Photo:Xinhua
Twin brothers Xu Zhigang (L) and Xu Zhiqiang, 74, remove weeds in the forest in Zhangchuan Village of Tongwei County, northwest China's Gansu Province, June 15, 2022. Photo:Xinhua
Xu Zhigang, 74, looks up to see the first tree he planted in 1968 in Zhangchuan Village of Tongwei County, northwest China's Gansu Province, June 15, 2022. Photo:Xinhua