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.

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The two charts illustrate the major causes of global land degradation and compare their effects to North America, Europe and Oceania during the 1990s. It is noticeable that over-grazing took the biggest responsibility in worldwide land degradation, while the deforestation and over-cultivation constituted moderately smaller shares.