China’s ‘Green Great Wall’ tames desert growth, but scientists warn the fight is not over

KUBUQI DESERT, China (AP) — For half a century, millions of workers have repeated a task across the deserts in northern China: inserting forearm-length sticks into shifting sand, first in a row, then in an intersecting line, gradually forming a grid. Then saplings are planted at the center of each small square.

The technique, known as “straw checkerboards,” is a simple yet widely used method to stabilize sand dunes against the wind and help plants take root by using water supplied through an irrigation system.

The widespread lattice it created across the sand has become the iconic image of China’s decades-long campaign against the spreading of desert conditions, known as the Three-North Protective Forest Program or the Green Great Wall.

The generations of work have yielded measurable progress, but scientists caution that preserving the gains will require decades of continued effort.

For a long time, drought, overgrazing and farming removed vegetation, harmed the soil and made areas vulnerable to wind and sandstorms. That kind of degradation of the land over time is known as desertification. The area of desertified land in northern China peaked in 2000, and it has been reduced by over 1,000 square kilometers (400 square miles) each year since then, according to data published by state media.

The Chinese government said the initiative launched in 1978 has played a crucial role in transforming vast regions covering nearly half of China from...