China’s Loess Plateau was anciently a lush area. But as more people made it their home, the demand for resources grew. Over the course of thousands of years, aggressive farming and overgrazing stripped away the vegetation almost entirely. This lead to severe soil erosion and eventually turned the Loess plateau into basically a denuded desert.
In the mid 1990s, Chinese and foreign scientists and civil engineers surveyed this area to see if anything could be done to restore the land. The project that followed has implications for much of the planet.