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

The pie chart illustrates the causes of worldwide

land

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degradation

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,

while

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the table presents the reasons that influenced three regions (North

America

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,

Europe

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, and Oceania) during the 1990s.

Overall

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, it is obvious that over-grazing was the main reason that led to the

degradation

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of

land

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.

Furthemore

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Furthermore

, the

degradation

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of

Europe

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was the highest compared to the other two regions. In the case of the reason for worldwide

land

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degradation

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, over-grazing was the main contributing factor which made up 35%.

Similarly

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, the proportion of deforestation was

also

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high (30%)

in contrast

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to others which impacted the least (7%). Regarding over-cultivation, the percentage was 28%. As for total

land

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degraded,

Europe

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was the highest. The proportion of degraded

land

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was 23% in

Europe

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, 13% in Oceania, and 5% in North

America

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. With regards to deforestation, the percentage of

degradation

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was 9.8% in

Europe

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, but 0.2% in North

America

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. Turning to over-cultivation, the

land

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in

Europe

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still degraded the most (7.7%).

By contrast

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, Oceania did not have any degraded

land

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;

however

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, it comprised 11.3% of over-grazing, which was the highest. The percentages of

Europe

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and North

America

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in over-grazing made up 5.5% and 1.5% respectively.