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

The diagrams illustrate the causes and effects of poor agricultural

land

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during the 1990s, comparing North

America

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, Europe, and

Oceania

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.

Overall

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, the primary cause of worldwide

land

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degradation

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is overgrazing, which accounts for 35% of the issue.

Oceania

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is the most affected, contributing 11.3%,

while

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North

America

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has the least impact, contributing only 1.5%.

In addition

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to overgrazing, the less common causes of

land

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degradation

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include over-cultivation and deforestation. Deforestation accounts for 30%,

while

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over-cultivation is responsible for 28%. Europe experiences the highest level of

land

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degradation

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at 23%, followed by

Oceania

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at 13%, and North

America

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at 5%. The primary contributor to European

land

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degradation

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is over-cultivation, which accounts for 3.3%,

while

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tree cutting contributes only 0.2%.

In contrast

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,

Oceania

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sees a significant impact from deforestation, contributing 9.8%,

while

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it only uses 5.5% of its farmland for grazing livestock, which is considered low. North

America

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does not cultivate its

land

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extensively

but

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, but

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significantly overgrazes it compared to the other regions, contributing 11.3% to total

land

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degradation

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.