The pie chart shows the main reason why agricultural land becomes less productive.

The pie chart illustrates the principal reason and causes why the agricultural field becomes less fruitful in three regions of the world during 1990 .

Overall

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,

deforestation

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and

over-cultivation

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were the highest ,followed by over-grazing and others. Europe experienced the most significant increase .

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,

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North America's percentages were the lowest among the three regions during

this

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year. On average, Europe in approximately 23% of land degradation with around 9%

deforestation

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, 7%

over-cultivation

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and 7% over-grazing.After that ,Oceania in practically 13% of land deterioration with nearly 2%

deforestation

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and 11% over-grazing and lately, North America with a proportion of 5% land degradation with about 2%

deforestation

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,3%

over-cultivation

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and

finally

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1% over-grazing. In

this

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figure, the rate of territory deterioration worldwide has reached a maximum of 35% in over-grazing ,

then

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followed by a considerable rate of 30% in both

deforestation

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and

over-cultivation

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.

Therefore

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, the rate with a minimum of only 7% is another cause of worldwide area degeneration.