In the 1990s, China began regreening one of Earth's most eroded landscapes; more than 100 million tons of soil stopped entering the Yellow River each year

Imagine a piece of land larger than France, stripped so bare that its dust once blew all the way to Beijing. By the late 1990s, that was the state of the Loess Plateau in northern China. Then something shifted. Farmers planted trees, and the hillsides were green again. And a World Bank feature story on the project noted that the soil washing into the Yellow River had been cut by more than 100 million tons a year.

A landscape that was falling apart

The Loess Plateau covers over 640,000 square kilometers across various provinces in China, per World Bank project records. The plateau takes its name from the soil type, loess, which has been transported by the winds in the area for many thousands of years. The soil is fertile, but also fragile. Centuries of agricultural use, livestock grazing, and deforestation have removed all the vegetation that once protected the soil from erosion. By the late 20th century, the area had become one of the most severely eroded places on the Earth. With every monsoon, rain tore across the bare hillsides, carrying soil into the Yellow River. That’s how the river got its name. The muddy water is said to have pushed riverbeds downstream, making floods perilous for millions of people. Meanwhile, the plateau’s farmers were trapped in poverty. Poor soil meant poor harvests, which pushed farmers to cultivate even the steepest, most fragile slopes.

Turning hillsides back into forest

China's response came in phases. In 1994, the government teamed up with the World Bank on the first of two Loess Plateau watershed rehabilitation projects that paid farmers to build terraces, plant trees and change how they managed grazing. A few years later, in 1999, Beijing launched a separate, much larger effort called the Grain for Green Program, which by 2002 had spread to 25 provinces. The program paid farmers not to grow crops on steep, erosion-prone slopes and instead plant trees or grass. This was more than a tree-planting project. The effort aimed to protect farmers’ livelihoods by compensating them with grain and money for giving up farmland. Gradually, vegetation returned to the barren slopes, and farmers began cultivating terraced land.

What the data actually shows

Researchers have been tracking this for years, and the evidence points the same way: less soil is washing off into the rivers. A 2009 paper in the International Journal of Sustainable Development & World Ecology by Zhou, Gan, Shangguan, and Dong examined the level of sediment discharge in two river basins: the middle Yellow River in Shaanxi Province, which sits within the Loess Plateau region this article focuses on, and the upper Yangtze River in Sichuan Province, included in the study as a separate comparison basin outside the plateau. The authors found that the increase in the number of acres under the Grain for Green program was associated with a decrease in the amount of discharged sediment in the Shaanxi basin; moreover, this decrease tracked the spread of the program more closely than it tracked changes in rainfall, suggesting vegetation played a larger role than weather alone, though the study's design doesn't establish causation outright.

A 2023 study in the journal Science of the Total Environment adds a more recent, quantified data point. As reported by Kong et al. on the sedimentation patterns of the mid Yellow River basin, annual sediment load in the upper and mid Yellow River has dropped from around 1.6 billion tons in previous decades to 0.3 billion tons as of the study's most recent measurements, reported in 2023, which the study associates with soil and water conservation practices in the Loess Plateau. That’s a major change for a river that once carried enormous amounts of silt.

Why this story matters beyond China

It’s easy to assume that land so damaged remains that way. The Loess Plateau begs to differ. This project also pulled people out of poverty. The official World Bank records show more than 2.5 million people living in four provinces, namely Shanxi, Shaanxi, Gansu, and the Inner Mongolia Autonomous Region, benefited through the project by seeing their income levels increase from $70 to $200 per year per individual between the project's 1994 launch and its assessment period, reflecting improved agricultural productivity and diversification. These are historical, unadjusted figures from that era, not current dollar values.

However, no rehabilitation project is without faults. Some scientists have raised concerns about water use for newly planted trees in this arid area and about possible food shortages if too much farmland is abandoned. These are fair questions, and researchers are still working through the long-term trade-offs. Still, the core result is compelling. An area once seen as severely degraded has begun to recover, and the river now carries less silt. For readers concerned about climate damage and disappearing topsoil, it is encouraging evidence that large-scale ecological repair can work.