The pie chart shows the main reason why agricultural land becomes less productive. The table shows how these cause affected three regions of the world during the 1990s.

Numerous reasons for being less productive on agricultural

land

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are depicted in the given pie chart,

while

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the mentioned table illustrates how it affected three different areas named North America, Europe, and Oceania during the 1990s, the figure being mentioned in percentage.

Overall

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, it can be seen that over-grazing was the most popular reason for

land

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degradation.

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, the percentage of

land

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degraded by over-grazing in Oceania was recorded as the highest among the three regions. Looking at the pie chart, over-cultivation was the least cause of the degradation of the

land

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, with 28%. Followed by deforestation at 30%.

Moreover

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, the proportion of over-grazing was the highest, accounting for 35%.

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, 7% of other reasons were

also

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mentioned. As for the table, in Europe, less productive agricultural

land

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was 23% in total and represented the highest among the three areas. Therein, 9.8% was from deforestation, 7.7% was from excessive farming, and over-grazing accounted for 5.5%. Followed by Oceania, the percentage of

land

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degraded was 13% in total, cutting down trees occupied 9.8%, and 11.3% from excessive farming.

Finally

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, in North America, the sum of degraded

land

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was 5%. Therein, over-cultivation accounted for 3.3%, 1.5% from excessive grazing, and 0.2% from clearing trees in the forest.