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Desertification, that is, land degradation as a result of climatic variations or human activity, is now a direct threat to over 250 million people around the world, and an indirect threat to a further 750 million people. In the last 25 years, desertification has become increasingly apparent in the dry sub-humid regions of the world. The authors of this book, two scientists jointly commisssioned by the United Nations Environment Programme and the World Meteorological Organization, have produced a referenced report on current knowledge of the interactions of desertification and climate in the drylands (excluding hyper-arid regions) of the world. They conclude with a series of recommendations for future dryland management strategy.