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

degradation, and the table illustrates the causes of

land

degradation by region over a 10-year period.

Overall

,

it is clear that

the main cause of

land

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

land

.

According to

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

land

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

,

whereas

more

land

in

Oceania

was destroyed by over-grazing. 1.7% of the

land

of

Oceania

and 0.2% of the

land

of North America deforested,

while

3.3% of the

land

of North America and 0% of the

land

of

Oceania

overcultivated. 5.5% of European

land

was overgrazed, but 1.5% of North American

land

was destroyed by overgrazing.