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

The figures illustrate the

number

of several reasons that have an

impact

on to decline productivity of agricultural

land

, and the

number

of causes of

land

degradation

in North America,

Europe

, and Oceania in the 1990s.

Overall

, over-grazing, over-cultivation, and deforestation

,

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are the several main reasons that have an

impact

on the productivity of agricultural

land

.

In addition

, North America,

Europe

, and Oceania are the countries that experiencing

land

degradation

. From the pie chart,

It is clear that

the

number

of over-grazing has a huge

impact

on agricultural

land

productivity,

while

there

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7% other reasons. It can

also

be seen that deforestation is the second factor why agricultural

land

becomes less productive. Meanwhile, the

number

of

land

degradation

that is

caused by over-cultivation is only 28%.

Furthermore

, based on the table, it is obvious that the highest proportion that make

land

degradation

in North America is over-cultivation with the

number

3.3%.

This

is a different situation from

Europe

because the most impactful factor that causes

land

degradation

in

Europe

is deforestation.

On the other hand

, over-grazing has a huge

impact

on

land

degradation

in Oceania.