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(Answer #2). True deserts cover about 14 percent of the world's land area, or about 8,000,000 square miles (20,800,000 square kilometers). Another 15 percent of the Earth's land surface possesses some desertlike characteristics.
Desertification has become a longstanding and increasingly severe problem in many parts of the world, and in developing countries in particular. According to a UNEP (1984) estimate, 35 per cent of the earth's land surface (4.5 billion ha) - an area approximately the size of North and South America combined - and the livelihoods of the 850 million people who inhabit that land are under threat from desertification.