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.

The pie graph indicates the primary reasons that the production of farming

land

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decreased,

while

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the accompanying table highlights

land

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degradation

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across North America, Europe and

Oceania

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and how they were affected from 1990 to 2000.

Overall

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, over-grazing, over-cultivation and deforestation

were emerged

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as three main elements with almost the same proportions that affected

land

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loss.

Additionally

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, Europe and

Oceania

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were affected by these reasons the most and the least respectively. Overgrazing was the primary reason for worldwide

land

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degradation

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with 35% and was followed by over-cultivation which was in charge of nearly one-third of changes, deforestation (28%) and other unspecified factors accounted for the remaining 7%. The greatest

land

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degradation

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happened in Europe amounting to 23% of the

overall

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total and the main reason was deforestation with a rate of 9.8%.

Moreover

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, the second-largest

land

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degradation

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took place in

Oceania

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at 13% and was

susequently

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subsequently

followed by North America with only 5%. It is worth noting that over-cultivation had no role in degrading

land

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in

Oceania

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,

while

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it was the main cause in North America.