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By Biggelaar, Lal, Wiebe, Eswaran, Breneman & Reich, 2003.

As more than 99% of human food is coming from the land (Pimentel and Pimentel, 2000), soil is one of our important natural resources and a major factor in global food production. However, soil management has frequently had major impacts, both positive and negative, on the properties of the soil that govern its productivity. Erosion is widely considered to be the most serious form of soil degradation, undermining the long-term viability of agriculture in many parts of the world (Lal, 1994). Oldeman et al. (1991) estimated that erosion accounts for 84% of the total global area of degraded soils, ranging from 68% in South America to 99% in North America.

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