China has transformed 34.3 million hectares of farmland into forest or grassland in the past two decades, and the green area added during the period accounts for over 4 percent of the global increase, according to a white paper released by the National Forestry and Grassland Administration on Tuesday.

The country initiated the Conversion of Cropland to Forest and Grassland Program in 1999, a landmark ecological recovery project that involves 25 provincial-level regions and has received total funding of 517 billion yuan ($73.2 billion) from the central leadership, the document said.

New green cover gained through the program from 1999 to 2019 takes up 40.5 percent of the nationwide greening as a result of all major ecological and tree-planting exercises. The forest coverage rate in key construction areas of the program rose by 4 percentage points on average during the period, according to the document.

The program has also generated ecological benefits worth 1.38 trillion yuan, more than double the total investment, according to the white paper, which provides a comprehensive view of China's efforts in converting croplands into green areas.

In the meantime, the program has contributed to boosting income for rural residents and alleviating poverty. About 41 million households in the countryside have participated in the program, and 158 million individuals have benefited directly from the program.

Through the program, rural participants received a subsidy of 9,000 yuan per household, and their streams of income have been expanded by developing auxiliary industries and seeking job opportunities in other cities.

From 2007 to 2016, the per capita disposable income of rural households enrolled in the program rose by 14.7 percent annually, 1.8 percentage points higher than the national level, the white paper said.

In order to upgrade management skills and protect the rights of rural households, China has also rolled out and improved a series of regulations and guidelines that help step up supervision and promote successful practices across the country.

However, the white paper noted that more efforts are needed to ensure implementation, enhance subsidy and compensation policies and establish a long-term mechanism to consolidate achievements.

The country will continue to coordinate the development of production, livelihood and ecological reservation. The scale of the program will be further expanded, and its quality and benefits will be improved, the white paper said.