Photo taken on July 24, 2018 shows technicians planting trees in Kubuqi Desert in Erdos, north China's Inner Mongolia Autonomous Region. Friday marks China's National Tree Planting Day. With the efforts of volunteers across the country, green lands has covered more areas of China and the eco-friendly development concept is seeded in people's heart. (Xinhua/Zou Yu)

A volunteer and a child water a seedling just planted in Shicong Village, Huzhou City of east China's Zhejiang Province, March 11, 2020. Friday marks China's National Tree Planting Day. With the efforts of volunteers across the country, green lands has covered more areas of China and the eco-friendly development concept is seeded in people's heart. (Xinhua/Huang Zongzhi)

Aerial photo taken on March 6, 2020 shows people controlling sands with grasses in Gulang, northwest China's Gansu Province. Friday marks China's National Tree Planting Day. With the efforts of volunteers across the country, green lands has covered more areas of China and the eco-friendly development concept is seeded in people's heart. (Xinhua/Fan Peishen)

Photo taken on Oct. 23, 2020 shows villager Wang Tianchang watering seedlings in Hongshui Village, Wuwei City of northwest China's Gansu Province. Friday marks China's National Tree Planting Day. With the efforts of volunteers across the country, green lands has covered more areas of China and the eco-friendly development concept is seeded in people's heart. (Xinhua/Ma Xiping)

Photo taken on April 26, 2019 shows a worker carrying seedlings to be planted in Hobq Desert in Erdos, north China's Inner Mongolia Autonomous Region. Friday marks China's National Tree Planting Day. With the efforts of volunteers across the country, green lands has covered more areas of China and the eco-friendly development concept is seeded in people's heart. (Xinhua/Peng Yuan)

Photo taken on Aug. 7, 2018 shows a man pulling mulls carrying seedlings on a forestry in Fengning Man Autonomous County, north China's Hebei Province. Friday marks China's National Tree Planting Day. With the efforts of volunteers across the country, green lands has covered more areas of China and the eco-friendly development concept is seeded in people's heart. (Photo by Wang Liqun/Xinhua)

Photo taken on March 12, 2020 shows a villager planting a seedling in a forestry in Jinping County, southwest China's Guizhou Province. Friday marks China's National Tree Planting Day. With the efforts of volunteers across the country, green lands has covered more areas of China and the eco-friendly development concept is seeded in people's heart. (Xinhua/Yang Wenbin)

Photo taken on May 29, 2018 shows Zhang Lianlian helping a seedling up in Leipingta Village, Yan'an City of northwest China's Shaanxi Province. Friday marks China's National Tree Planting Day. With the efforts of volunteers across the country, green lands has covered more areas of China and the eco-friendly development concept is seeded in people's heart. (Xinhua/Shao Rui)

Photo taken on March 12, 2018 shows children watering seedlings just planted at a park in Jishui County, east China's Jiangxi Province. Friday marks China's National Tree Planting Day. With the efforts of volunteers across the country, green lands has covered more areas of China and the eco-friendly development concept is seeded in people's heart. (Photo by Liao Min/Xinhua)

Photo taken on April 7, 2020 shows medical staff watering trees just planted at a park in Dongcheng District of Beijing, capital of China. Friday marks China's National Tree Planting Day. With the efforts of volunteers across the country, green lands has covered more areas of China and the eco-friendly development concept is seeded in people's heart. (Xinhua/Ju Huanzong)

Aerial photo taken on June 21, 2019 shows the Baijitan national desert park inside the Baijitan national nature reserve in Lingwu, northwest China's Ningxia Hui Autonomous Region. Friday marks China's National Tree Planting Day. With the efforts of volunteers across the country, green lands has covered more areas of China and the eco-friendly development concept is seeded in people's heart. (Xinhua/Feng Kaihua)

Aerial photo taken on May 24, 2020 shows a tree-surrounded watch tower "Zhenbeitai" built in the Ming Dynasty (1368-1644), Yulin City, northwest China's Shaaxi Province. Friday marks China's National Tree Planting Day. With the efforts of volunteers across the country, green lands has covered more areas of China and the eco-friendly development concept is seeded in people's heart. (Xinhua/Tao Ming)

Photo taken on July 13, 2019 shows Yao Zuyuan (1st R) and his family planting trees in Huoshaodian Township, Hanzhong City of northwest China's Shaanxi Province. Friday marks China's National Tree Planting Day. With the efforts of volunteers across the country, green lands has covered more areas of China and the eco-friendly development concept is seeded in people's heart. (Xinhua/Tao Ming)

Aerial photo taken on June 3, 2020 shows the Haizhu National Wetland Park in Guangzhou, capital of south China's Guangdong Province. Friday marks China's National Tree Planting Day. With the efforts of volunteers across the country, green lands has covered more areas of China and the eco-friendly development concept is seeded in people's heart. (Xinhua/Liu Dawei)

Photo taken on May 12, 2015 shows villager Huang Shenghong walking past seedlings he planted years ago in Mao'er Village, Huangzhong County, northwest China's Qinghai Province. Friday marks China's National Tree Planting Day. With the efforts of volunteers across the country, green lands has covered more areas of China and the eco-friendly development concept is seeded in people's heart. (Xinhua/Wu Gang)

Combination aerial photo taken on April 25, 2020 shows a heart-shaped grove planted to remember medical assistance teams in Xiangyang, central China's Hubei Province. Friday marks China's National Tree Planting Day. With the efforts of volunteers across the country, green lands has covered more areas of China and the eco-friendly development concept is seeded in people's heart. (Xinhua/Xie Jianfei)

Aerial photo taken on May 27, 2020 shows Zhang Yinglong, a man who gave up his well-paid job in Tianjin and joined in a forestation project in his ancestral home province of Shaanxi, observing on a watchtower to prevent forest fire in Gechougou Village, Shenmu City of northwest China's Shaanxi Province. Friday marks China's National Tree Planting Day. With the efforts of volunteers across the country, green lands has covered more areas of China and the eco-friendly development concept is seeded in people's heart. (Xinhua/Liu Xiao)

Aerial photo taken on March 12, 2019 shows volunteers planting trees in Boyan Village, Wu'an City of north China's Hebei Province. Friday marks China's National Tree Planting Day. With the efforts of volunteers across the country, green lands has covered more areas of China and the eco-friendly development concept is seeded in people's heart. (Xinhua/Wang Xiao)

Aerial photo taken on June 3, 2020 shows people carrying seedlings to be planted to a deserted mountain in Weizhuangzi Village, Zunhua City of north China's Hebei Province. Friday marks China's National Tree Planting Day. With the efforts of volunteers across the country, green lands has covered more areas of China and the eco-friendly development concept is seeded in people's heart. (Photo by Liu Mancang/Xinhua)

A drone is seen during a patrol of forest to prevent fire in Fenghuangling of Haidian District, Beijing, capital of China, May 1, 2018. Friday marks China's National Tree Planting Day. With the efforts of volunteers across the country, green lands has covered more areas of China and the eco-friendly development concept is seeded in people's heart. (Xinhua/Xing Guangli)