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

The pie chart illustrates the crucial reasons why agricultural

place

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places

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becomes

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become

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less productive,

while

the table compares

causes

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the causes

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and

affected

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effects in

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three variety areas of the world during

1990s

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the 1990s

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.

Overall

, over-grazing and deforestation were the biggest issues.

Moreover

, Europe had the largest

proportion

in

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of

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total land degraded. In detail, the share of over-grazing represented the biggest problem accounting for 35%,

while

that of deforestation made up the second highest percentage, at 30%. The figure for

over-cultivation

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the over-cultivation

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problem was 28% and it

four

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was four

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times higher than that other

for

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apply

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.

Although

there was

not

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no

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over-cultivation in Oceania, it comprised the second highest total land degraded

proportion

, at 13%. Europe and North America accounted for the total land degraded

proportion

, at 23% and 5% respectively. The percentage of over-grazing in Oceania was doubled that of Europe, at 11.3%. The

proportion

of over-grazing constituted less than 2% in North America. With regard to deforestation, there was all countries less than 10%.