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 provided diagram indicates the causes of

reducing

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the reduction

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in

land

used for agriculture,

whereas

, the table represents the effects of these reasons on different sections in

1990s

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the 1990s

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.

Overall

,

deforestion

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deforestation

,

over-cultivation

and over-grazing were the serious problems with grazing

accounted

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accounting

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for the most.

Moreover

,

grazing

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the grazing

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issue

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issues

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, in Oceania, posed a major threat to agriculture,

by

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in

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contrast with the threatened level of

over-cultivation

. Beginning with the pie chart representing

root

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the root

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reasons

of

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for

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land

degradation all around the world. It is evident that over-grazing had 35%, below

this

level, damage caused by deforestation was more than

over-cultivation

at 30% and 28%. The remaining adverse factors accounted for a tiny fraction of 7% in total. Turning to the table, regarding North America,

ony

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only

0,7% of

land

was

degradated

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degraded

by deforestation,

while

, these numbers were 3,3% and 1,5% in

over-cultivation

anf

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and

over-grazing, respectively. In Europe, 3 categories ranged from 5,5% to 9,8% of

land

which were 23% in total. Looking at the percentage of Ocenian with

the

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an

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aggregate of 13%,

this

data was contributed mostly by 11,3% of

land

from grazing and 1,7% from destroyed forest.