A sandstorm engulfed the city of Dunhuang, China on Sunday July 25. The image is spectacular, worthy of science fiction films with a wave of sand projecting between the buildings, plunging the 200,000 inhabitants into complete chaos. Within this wave of 100 meters high and several kilometers wide visibility is almost zero, car accidents almost inevitable and every motorist asked to stop.
The sky changes color over time, and turns from yellow to gray as thousands of particles, which come from the Gobi Desert, in the north of the country, infiltrate the heart of the houses. This meteorological phenomenon is recurrent in China. The only bulwark against this storm, called by the Chinese the “Yellow Dragon”, is a gigantic green wall made up of 86 million trees planted around the cities.