Environmental Graffiti

Bacteria Vs. Saharan Desertification

The Saraha desert is the largest hot desert in the world. Spanning some 3.5 million square miles (9 million square km), this desert is almost as large as the United States and is expanding south at a rate of about 30 miles (48 km) per year. To help slow or even stop this expansion, scientists have proposed using a species of our microbial nemesis that turns ordinary sand into sandstone to construct a huge containing wall in the desert.

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