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.

A glance at the pie chart reveals some information about the causes of global

land

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degradation, and the table illustrates the causes of

land

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degradation by region over a 10-year period.

Overall

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,

it is clear that

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the main cause of

land

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erosion was over-grazing and the region of Europe had the most degraded

land

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.

According to

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the pie chart, over-grazing, over-cultivation and deforestation destroyed

land

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more than other factors because the sum of these three elements is 93

percent

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per cent

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of 100. Over-grazing, deforestation and over-cultivation are 35%, 30% and 28% respectively. Europe had the most deforestation and over-cultivation in comparison with North America and

Oceania

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,

whereas

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more

land

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in

Oceania

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was destroyed by over-grazing. 1.7% of the

land

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of

Oceania

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and 0.2% of the

land

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of North America deforested,

while

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3.3% of the

land

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of North America and 0% of the

land

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of

Oceania

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overcultivated. 5.5% of European

land

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was overgrazed, but 1.5% of North American

land

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was destroyed by overgrazing.