Desertification, or the expansion of the desert onto formerly fertile land, has long been a problem in many parts of the world. Already about 120,000 sq. kms (or 12 million hectares) of China's land...
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Desertification, or the expansion of the desert onto formerly fertile land, has long been a problem in many parts of the world. Already about 120,000 sq. kms (or 12 million hectares) of China's land...