the pie chart below shows the main reasons why agricultural land becomes less productive.The table shows these causes affected three regions of the world during the 1990s.

The pie chart gives information about the three main causes of worldwide

land

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degradation

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, and the table illustrates the shares of three regions (North

America

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, Europe, and Oceania) in

land

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degradation

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during the 1990s.

Overall

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,

it is clear that

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over-grazing was a key factor for

land

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degradation

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in the globe, followed by deforestation.

In addition

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, Europe had the biggest proportion of total

land

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degradation

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,

while

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North

America

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had the lowest

share

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. Over-grazing accounted for the biggest

share

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with approximately one-third of all

share

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for

land

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degradation

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, followed by deforestation with 30%.

In addition

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,

over-cultivation

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stood third rank with 28%, and 7% remaining allocated to other causes of worldwide

land

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degradation

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. Europe ranked first in total

degradation

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with 23%,

while

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North

America

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stood

last

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.

Although

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deforestation was the most important factor for

land

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degradation

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with 9.8%, the roles of

over-cultivation

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and over-grazing with 7.7% and 5.5% respectively, should not be ignored. In Oceania, over-grazing with 11.3% was responsible for the biggest

share

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of

land

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degradation

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,

whereas

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the figure for

over-cultivation

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was zero. In North

America

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,

However

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,

over-cultivation

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was the significant factor for

land

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degradation

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was 3.3%, over-grazing had almost the half of

share

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of

over-cultivation

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.