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.

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pie chart illustrates the major factors because of which food farm blind gates lees fertile

along with

the table, which indicates the impacts of these reasons in three continents worldwide from 1990 to 1999.

Overall

, as can be seen, the largest percentage of

land

degradation

belongs to over-grazing (35%).

Also

, Europe lost the most

land

during the 1990s (23%). Looking more closely at the pie chart,

it is clear that

the second and third most important factors for

land

degradation

are deforestation and overcultivation, with 30% and 28% respectively. other reasons account for the smallest percentage, with only 7%.

On the other hand

, a closer look at the table reveals that deforestation had the most important role in Europe, with 9.8%,

while

it had the least important role in North America, with 0.2%.

Also

, over-cultivation ruined most of the

land

in Europe, with 7.7%; considerably, it had no role in Oceania. Over-grazing was responsible for the most

land

degradation

in Oceania, with 11.3%.

However

, it was responsible for the least

land

degradation

in North America, with 1.5%. In summary,

it is clear that

North America lost the least

land

during the 1990s, with only five

percent

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.