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

,

deforestation

and

over-cultivation

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

While

,

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

this

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

deforestation

, 7%

over-cultivation

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

deforestation

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

deforestation

,3%

over-cultivation

and

finally

1% over-grazing. In

this

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

then

followed by a considerable rate of 30% in both

deforestation

and

over-cultivation

.

Therefore

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