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

The pie chart illustrates the percentage of different factors causing degraded

land

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around the world and the table presents those sectors in 3 separate continents from 1990 to 1999.

It is clear that

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the main reason for worldwide

land

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degradation was over-grazing by types of cattle, followed by deforestation.

Besides

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, Europe took up the largest proportion of total

land

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degraded,

while

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the opposite was true for North America. As can be seen, over-grazing was recorded to be at the top of the list with 35%, yet the fraction of deforestation made up 30%.

Moreover

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, Over-cultivating was

also

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a big problem causing damage to the soil as it accounted for 28%, compared to only 7% for other reasons. Regarding some regions in the world, Europe had the biggest figure for the total of

land

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broken down, at 23%, in comparison with only 5% in North America.

Additionally

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,

while

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deforestation was the principal factor in Europe with 9.8%, it was true for over-grazing in Oceania with 11.3%. As well, Over-cultivation in North America comprised 3.3%, but no data for that was found in Oceania.