The pie chart below shows the main reason why agriculutural land become less productive. The table shows how these causes effected three regions of the world during the 1900s

The pie chart outlines the key factors as to why

land

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used for agriculture produces less over time,

while

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the table gives a breakdown of the effect these

causes

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had on agricultural

land

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in three regions during the 1990s.

Overall

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, over-grazing,

deforestation

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, and

over-cultivation

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were all significant

causes

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of

land

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degradation globally.

Furthermore

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, Europe had the highest total degraded

land

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,

whereas

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North America had the least. In terms of the

causes

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of

land

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degradation, over-grazing was the most significant factor in the

land

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with 35% of the

land

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being affected in

this

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way.

This

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was closely followed by

deforestation

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(30%) and

over-cultivation

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(28%), with the remaining 7% being made up of other

causes

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Regarding the table,the North American region had the lowest amount of degraded

land

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at just 5%. Of

this

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land

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, about two-thirds was damaged by

over-cultivation

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, just under a third by over-grazing, and a minimal amount by

deforestation

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.

In contrast

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, almost a quarter (23%) of arable

land

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in Europe was degraded. The main factor in Europe was

deforestation

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, with 9.8% of total

land

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affected in

this

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way.

Over-cultivation

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and over-grazing were 7.7 % and 5.5% respectively. In Oceania, the main cause of

land

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degradation was clearly over-grazing with 11.3% of

land

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being affected by

this

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out of a total of 13% of

land

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degraded in total.

Conversely

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,

over-cultivation

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appeared to play no role in

this

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part of the world,

while

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deforestation

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affected only a relatively small amount (1.7%)