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 chart shows the possible reasons

of

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for

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land degradation around the globe,

while

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the table depicts the causes by

regions

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region

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. Units are measured in percentages.

Overall

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, what stands out from the graphs is that lands are mainly damaged by over-grazing.

Furthermore

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, the most affected lands are in Europe. Looking into detail, regarding the causes, over-grazing ranked first with 35%, which is followed by the deforestation of plants with 30%. The percentage of the over-cultivation reason for land degradation is just above one in four which is fourfold other reasons(7%). In terms of causes in different regions, in North America, 3.3%

land

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of land

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degraded

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is degraded

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by over-cultivation, which is more than two times higher than that

by

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of

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over-grazing.

However

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, in Europe, most of

lands

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the lands

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were damaged by deforestation (9.8%),

while

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other factors were almost the same (around 6%).

Moreover

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, the figures for deforestation in North America and Oceania were less than 2%,

whereas

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over-grazing ranked first in Oceania with just above one in ten.