In 2019, a NASA satellite map with dark and light green colors showed the world that China is leading the increase in greening on Earth’s land area because of national tree-planting programs.

【小题1】over 45 percent of China’s land is covered with deserts and sandy soil, way bigger than China’s arable land (可耕地) which is nearly 10 percent of the total arable land in the world, but supports over 20 percent of the world’s population

March 12 marks China’s Tree Planting Day.【小题2】. At the time, a forestry expert suggested designating (定义) the Qingming Festival, also known as Tomb-Sweeping Day, as the National Tree Planting Day. After the death of Sun Yat-sen on March 12, 1925, the National Tree Planting Day was changed to fall on March 12 to remember Sun’s support for national afforestation (植树造林).

Since the People’s Republic of China was founded in 1949, the Chinese government has continued to use the day to honor Sun’s contribution to the country.【小题3】

In 2019，a research team of Boston University found that the global green leaf area has increased by five percent since the early 2000s. 【小题4】 , they thought it was because of a “warmer, wetter climate and fertilization from the added carbon dioxide in the atmosphere”. But with a two-decade-long data (数据) record from NASA, they see that humans are contributing.【小题5】.

In 2021，China planted 3.6 million hectares of forest and changed 380,800 hectares of farmland into forest. The country plans to plant 6.4 million hectares of trees and grass this year.