The Pie chart below show the main reasons why agricultural land becomes Iess productivitive. The table shows how these causes affected regions of the world during the 1990s.

The given chart and table provide information on how agricultural productivity reduced among regions: North America, Europe and Oceania, in the 1990s.

Overall

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, there were four main reasons for less crop production, with the most prominent one being over-grazing. In terms of the amount of land degradation, the European countries had the highest proportion of degraded area with a significant difference from other regions.

According to

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the data, over-grazing accounted for 35% as the main reason for crop reduction, followed by deforestation at 30% and over-cultivativating at 28% respectively. When compared among regions, Europe had lost the accumulation of 23% of their agricultural area, which was almost equally shared by the three mentioned causes around 5.5 to 9.8%.

In contrast

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, North America had the least amount of land degradation, at 5% in total, which mainly resulted from over-cultivation at 3.3%. Meanwhile, Oceania faced degradation

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from over-grazing as the major issue.