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The pie chart below shows the main reasons why agricultural land becomes less productive. The table shows how these causes affected three regions of the world during the 1990s. v. 7 The presented pie chart outlines main reasons for degradation of farming land worldwide. Meanwhile, the table lists the percentages of land degradation caused in the three regions in the world in the 1990s. In general, deforestation and over-grazing are true as massive factors for agricultural land ...