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

The pie chart displays the

percentage

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of the main cause of agricultural lands becoming unproductive. The table shows how

land

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is affected by these reasons between the

three

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continents. Looking at both graphs, there is less link between how the

percentage

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of these causes worldwide affected the

three

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areas. Having 23% of

land

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degraded, Europe is at the top list, with its

three

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different reasons ranging from 5.5 to 9.8 %.

Second,

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in the list with a total

percentage

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of less productive of 13% is mainly caused by overgrazing and deforestation. Surprisingly, none of the degraded

land

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is caused by overcultivation.

While

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overgrazing is the biggest factor, the data is only applicable to Oceania. In North America and Europe, the largest contributing factors are over-cultivation and deforestation with a

percentage

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of 3.3 and 9.8% respectively. Being one-third of the reason

percentage

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, the value of degraded

land

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percentage

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of the

three

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regions does not correspond to the value of the worldwide.

Overall

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,

although

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for both figures, the causes may be the same, there is no matching relationship between the values of both graphs.